Tony Dungy, Bill Polian

Indianapolis Colts coach Tony Dungy, left, hugs team president Bill Polian after it was announced that Dungy will retire as head coach in Indianapolis, Monday, Jan. 12, 2009. Dungy has been a head football coach in the NFL for 13 years, seven with the Colts. He will be replaced by Jim Caldwell. (AP Photo/Michael Conroy)

(Michael Conroy)

Orchard Park, N.Y. -- Bill Polian has quite the legacy.

He was the man who constructed the Buffalo Bills' roster when the team went to four straight Super Bowls. He won a Super Bowl in Indianapolis, largely because as the general manager he chose Peyton Manning over Ryan Leaf with the No. 1 pick in the 1998 draft. He has since been inducted into the Hall of Fame.

Now an analyst for ESPN, Polian hasn't stopped opining on NFL happenings, and he has a take on the 2017 NFL Draft's quarterback group. Right now, four quarterbacks appear to be in play to be the first quarterback off the board. Clemson's Deshaun Watson, North Carolina's Mitch Trubusky, Notre Dame's Deshone Kizer and Texas Tech's Patrick Mahomes have all received varying degrees of hype in the early goings of the pre-draft process. Polian, however, thinks there is a quarterback more talented than all of them.

"The psychological testing is really, really important," Polian said on ESPN's Mike and Mike this week. "The background goes without saying. By the way, the most talented quarterback in the draft is probably Chad Kelly, but he has a ton of baggage," Polian said. "So you get that out of the way immediately."

Kelly, the Ole Miss quarterback who is the nephew of former Buffalo Bills quarterback Jim Kelly, has been in the news this week after the NFL rescinded his invitation to the scouting combine. Kelly's invitation was rescinded because of off-field issues which include getting dismissed from Clemson's football program and pleading guilty to a noncriminal disorderly conduct charge after an incident at a Buffalo nightclub.

Kelly's senior season ended with a torn ACL, and his on-field game was ripe with inconsistency and poor decision making. It's worth noting Polian is close with the Kelly family and once stumped for Landry Jones as the best quarterback in the 2013 draft.

Right now, Kelly is projected as a late-round pick given all of his baggage. To Polian's credit, Kelly certainly has physical tools teams look for, but there are plenty of red flags. That's why Watson, Trubisky and Kizer have been pegged as the top three quarterbacks in the class with Mahomes in the picture as well. Polian isn't sold on any of them being ready.

"The bottom line is that the psychological testing, the ability to process quickly, which you have to extrapolate and get them on the board and see it on the tape, and then the ability to mature and grow, the work ethic, become the three things you base the decision on," Polian said. "We took Peyton Manning in Indianapolis because we saw the finished product, as opposed to Ryan Leaf who was not the finished product and had a lot of problems. We took the sure thing. It wasn't popular. It wasn't what the cognoscenti thought was the right thing to do. But we were convinced after the process that, hey, we've got a guy over here who is ready to play, who is ready to be a pro vs. one who isn't. Now we're talking about three guys who for varying different reasons aren't even close to being ready."

The Bills hold the No. 10 pick in the 2017 NFL Draft and could be in the market for a quarterback. If Polian is to be believed, the Bills would be doing quite a bit of guess work by taking any of the players mentioned above with that pick.