Here is a topic that is sure to spur debate: According to "Pro Football Focus," Miami Dolphins quarterback Ryan Tannehill is better than Pro Bowler Andrew Luck of the Indianapolis Colts.

Say what?

PFF released its 2015 quarterback rankings entering the regular season, basing the rankings on their own set of metrics. Tannehill was rated No. 10, one spot behind Russell Wilson of the Seattle Seahawks. Missing from the top 10 was Luck, who has led the Colts to the playoffs in each of his three seasons. Last year Indianapolis was one game away from the Super Bowl.

This analysis is way off base. Tannehill is not superior to Luck in throwing ability, stats or wins. I like the strides Tannehill is making in his fourth season, but Luck is already there. It’s even more embarrassing Luck isn't rated in the top 10. There is not a talent evaluator in the NFL who would agree with that.

Here are PFF’s thoughts on Tannehill:

"Is he among the best five quarterbacks in the league yet? No, but Ryan Tannehill has quietly put himself in the top 10 with his play over the past two seasons. He was the sixth-most accurate QB in the league last year. Our sixth-highest graded passer in 2013, he dropped slightly to 10th this past season, but looks poised for a big year with the Dolphins and an improved supporting cast.”

One of the biggest questions I have about Tannehill is his ability to raise the level of his team. For example, Tannehill had a decent year in 2013 and Miami finished 8-8. Tannehill had a career year in 2014 and the Dolphins still finished 8-8. Tannehill still lacked in key areas, such as fourth-quarter performance, that could have put the Dolphins over the hump and into the playoffs.

The Colts would be a bottom-half team in the NFL without Luck. At best they would be a mediocre team. Luck's skill, presence, leadership and clutch ability to raise the level of his teammates around him makes him a top 5 quarterback in the league. It's the same traits that greats such as Tom Brady, Aaron Rodgers and Peyton Manning also have.

Whether Tannehill is a top-10 quarterback is a separate debate. I would put him in the 13-15 range, but I also view Tannehill as an ascending player. He is making improvements, and I expect him to have a successful fourth season. But Tannehill is not better than Luck.