When lefty reliever Andrew Miller was traded by the New York Yankees to the Cleveland Indians last summer, it changed the trajectory of the 2016 Major League Baseball season. Not only did the deal, along with another high-profile trade that sent Aroldis Chapman to the Chicago Cubs, mark a stark contrast from the Yankees’ normal trade deadline approach, Miller and Chapman were the centerpieces of the two bullpens that reached the World Series.

The 2016 World Series ended up being one of the most watched and most talked about Fall Classics in my lifetime, and as a result, Miller became a household name beyond the hardcore baseball fan community and the cities where he has pitched like Cleveland, New York, Baltimore, and Boston. It was a true Series for the Ages, and Miller put together a brilliant postseason for the Tribe, including being named ALCS MVP. One of the biggest moments of the series was when Chicago catcher (and fellow bearded 2013 World Series Champion) David Ross homered off him in Game 7, but that hardly diminishes Miller’s standing as one of the elite relief pitchers in the game today.

One of the lessons I have taken away from me recent re-watch of Ken Burns’ Baseball is how often great pitchers slip up in these big moments, because you have to be really good to be on the mound in these ultimate high-leverage situations. Kirk Gibson’s pinch-hit home run in the 1988 World Series was an incredible feat not only because of how physically hobbled he was at the time, but also because it was Dennis Eckersley, the best reliever of his era, standing on the mound at the height of his powers for the Oakland A’s. Much of The Tenth Inning, in fact, is devoted to big moments in which Mariano Rivera, the greatest closer of all time, could not close the deal in both the 2001 World Series against the Arizona Diamondbacks and the 2004 American League Championship Series against the Boston Red Sox.

What makes Miller so interesting is that unlike Eckersley or Rivera, Miller is not primarily a closer. In the 2016 postseason Cleveland manager Terry Francona elected to throw Miller out there in the highest leverage moments of the game, to shut down the opposing offense, regardless of what inning it was once the starter was out of the game. This unconventional bullpen approach, which flies in the face of decades (or maybe even a century, as I’m not entirely sure when the conventional system of bullpen structure first solidified, and much of “just the way things are done” in baseball dates back to the 19th century, and I didn’t have time to take a deep dive on bullpen usage history for what was supposed to be a quick tangent) of clearly defined relief roles. You have the “7th Inning Guy,” the “8th Inning Guy,” and the “9th Inning Guy,” and the guy pitching the 9th should be your best guy, your closer. Miller’s use in 2016 was a potential game-changer.

The rise of Andrew Miller since he became one of MLB’s best relievers starting in 2014 may very well be enough already to change some people’s minds about his entire career. For instance, in 2007, Miller was traded by the Detroit Tigers along with Dallas Trahern, Burke Badenhop, Frankie De La Cruz, Cameron Maybin, and Mike Rabelo to the Florida Marlins for Dontrelle Willis and Miguel Cabrera. For eleven years, this was widely regarded as one of the most one-sided trades in recent baseball history, and then-Tigers GM Dave Dombrowski has been widely lauded for pulling off the steal of Cabrera, who would go on to win two American League MVPs, earn the first offensive Triple Crown since Carl Yastrzemski in 1967, and led Detroit to the World Series in 2012.

Cabrera has been one of the best hitters in the game for over a decade, and was still only 24 when the Marlins dealt him to Detroit. While the Tigers consistently contended in the decade that followed, the Marlins toiled in futility. There are obviously other factors involved. Miguel Cabrera was not the only great player on the Tigers during that stretch, and trading Cabrera was hardly the only baseball operations misstep by the Marlins in the years before, during, and since, but there was a clear winner and a clear loser in that trade. My worry now, is that decades from now, or probably sooner, people will go on Baseball Reference, see Cabrera’s page linked to Miller’s page by virtue of that trade, and think maybe that trade was not so bad for the Marlins because of the player Miller eventually turned into.

I can remember in the spring of 2014, when I was working a second shift data entry job, and regularly listening to Red Sox games on the radio the pass the night. This was how I followed the Red Sox in 2013 (all the until Koji Uehara recorded the final out of the World Series), 2014, and 2015, until I got moved to first shift. During one game, I remember, they had Alex Speier, a very knowledgeable baseball writer who at the time wrote for WEEI.com (he is now with The Boston Globe) in the broadcast booth to talk with Joe Castiglione and Dave O’Brien, and he talked about Miller and Burke Badenhop, who was new to the Red Sox that season and has one of my favorite names in all of baseball (I mean seriously, a ground ball pitcher with “bad” and “hop” in his name?). Speier talked about talking to Miller and Badenhop about the historic trade, about being forever connected to Cabrera, who had signed a record contract extension with the Tigers in the previous offseason. (Side note: after a little bit of research, this WEEI.com article by Katie Morrison that Speier contributed to from May of 2014 has a lot of the insights I remember and more.)

For whatever reason, this exchange in a game I cannot remember for a particularly bad Red Sox team three years ago stuck with me. Miller and Badenhop both turned into fine Major Leaguers, but even if they did their best pitching after the Marlins, there are ways the trade could be justified.

A good cross-sport comparison I like to make to the Miguel Cabrera Trade is the trade that sent Kevin Garnett from the Minnesota Timberwolves to the Boston Celtics (sorry for all the Boston-centric references, it’s what I know best). The Celtics gave up a bundle of players for a superstar, and turned into a title contender overnight. The Wolves have yet to make the playoffs since trading KG, and that trade got Kevin McHale fired as Minnesota’s GM in time. While McHale could feel vindicated by the solid NBA careers Gerald Green and Al Jefferson had (the latter was so promising that some in the Boston media including legendary Celtics power forward/head coach/homer broadcaster Tommy Heinsohn adamantly did not want Big Al to get moved in a trade for Garnett), they were not enough to fill the void left by KG in Minnesota. Like the Marlins in 2008 after Cabrera got dealt, the Timberwolves of that same era were also not helped by other roster building missteps bigger than the one one-sided trade, most notably having back-to-back picks in the top ten of the 2009 NBA Draft, and used them on Jonny Flynn and Ricky Rubio, both point guards, but neither was Steph Curry, who was taken at #9 by the Golden State Warriors in that same draft.

In spite of the success of the Celtics and the futility of the Wolves in the years that followed, I cannot help but thinking how close it could have come to being different. What if, in the summer of 2007, when the Celtics had already traded for Ray Allen and everybody on the roster not named Paul Pierce was on the table to package in a trade for the third star, what if Danny Ainge had slipped Rajon Rondo and/or Tony Allen instead of Sebastian Telfair in a moment of desperation to get McHale to bite on the Garnett trade? Would the roster have been good enough surrounding the New Big Three to really contend with the Cavs, Magic, and Pistons of the late 2000s?

Similarly, what if Dombrowski threw Justin Verlander into the bundle of players because he was so desperate to reacquire Cabrera, whom Dombrowski first signed as an amateur free agent while GM of the Marlins in 1999? While one great pitcher would not necessarily have turned the Marlins’ fortunes around, it certainly would have made the trade a lot less one-sided. Dombrowski would certainly not have the same reputation he currently had of being a genius trader (which I’m a bit skeptical of as a Red Sox fan, with the Drew Pomeranz trade and such).

Without venturing too much further in the Miguel Cabrera Trade What-If Rabbit Hole, here’s one more: what if this October, in an American League Wild Card Game or later series-clinching game between the Tigers and Indians, Andrew Miller, in the highest of high-leverage moments of the season, gets out of the inning (and to raise the stakes just a little bit more, let’s say he’s in a bases-loaded jam) by striking out Miguel Cabrera on three pitches? Can you imagine the think pieces coming out “In defense of the Miguel Cabrera Trade”? I certainly can, and it hasn’t even happened yet. That is why I am writing this to get out in front of it.

Ultimately, I don’t think there is anything Andrew Miller can do to validate that trade from the Marlins’ perspective, and not just because he did not put it all together until years after leaving Florida. Miller always had good stuff. His big frame and high velocity made him an attractive prospect, selected sixth overall by the Tigers in the 2006 MLB Amateur Draft. During his time with the Red Sox, he was featured in the excellent documentary Knuckleball! as the hard throwing lefty who takes Tim Wakefield’s spot in the starting rotation in 2011 while Wake is in pursuit of his 200th career win. With all the love and respect in the world to Wakefield and R.A. Dickey, the two stars of that doc, Miller’s validation and vindication from his role on the 2011 Red Sox is a much lower bar to clear, and it’s fair to say the 2016 postseason did that for him.

While Miller’s reinvention from mediocre and frustrating starter to elite and dominant reliever has been a fascinating transition, but when a new generation browses Baseball Reference years from now and thinks the Cabrera Trade was a fair trade, we must be vigilant and ready to set the record straight. Or maybe Miller will somehow reach a new level of bullpen greatness so profound that he is more famous in fifty years than Cabrera, but I have my doubts. Either way, time will tell.