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Jeff Chiu/Associated Press

Whether or not you believe Jim Harbaugh wore out his welcome in San Francisco, the fact is that he had massive amounts of success in his time there. Harbaugh has the fifth-highest winning percentage in NFL history among coaches with 50 or more games behind only Guy Chamberlain, John Madden, Vince Lombardi and George Allen. His 44-19-1 record was the best record among any active coach in 2014, and being 25 games above .500 in only four seasons is an impressive feat, as well.

Also gone are both coordinators, with Vic Fangio ending up in Chicago and Greg Roman ending up in Buffalo. It will be tempting for 49ers fans to look at the University of Michigan’s overall record, the Bills’ offensive statistics and the Bears’ defensive statistics and compare them to the 49ers’ own performance in those areas.

That’s a lot of experience to replace in one offseason. Rather than hire an experienced name or a hot prospect, however, the 49ers stayed in-house, promoting Jim Tomsula, Geep Chryst and Eric Mangini up to the top three coaching spots.

This, understandably, did not precisely ignite the fanbase.

Geep Chryst’s record as an offensive coordinator? Just 9-23, with the team never ranking above 26th in yards or points. Some of that can be blamed on having to work with Ryan Leaf and an end-of-career Jim Harbaugh, but it’s not exactly the highlight of a resume.

Eric Mangini’s record as a defensive coordinator? A much better 10-6, but they ranked 26th in yards allowed themselves. His record as a head coach is worse, as he’s sputtered to a 33-47 career record in New York and Cleveland.

Jim Tomsula’s record as a coordinator? None, as he’s been promoted directly from a position coach to the top job without ever spending time running a defense in the NFL.

It’s no wonder that Tomsula regularly shows up at the bottom of head coaching rankings—he has essentially no comparable experience, with only a brief head coaching stint in the defunct NFL Europe to compare to.

Just because Tomsula doesn’t have experience doesn’t mean he will be a bad coach, it just means that people are right to be skeptical of him when compared to more established candidates.

It is worth noting, however, that Tomsula is tied for the best win-loss record in NFL history among coaches with at least one game coached, as he’s 1-0. If he can remain close to the top of that particular list, the 49ers will do just fine.

For the record, the best win-loss record of a coach with at least 17 games coached is Elgie Tobin’s 16-3-4 record with the Akron Pros in 1920 and 1921. Tomsula will need to go 14-2 to stay atop that particular statistic, which seems unlikely, at best.