Chip Kelly's stay in Philadelphia was a short and controversial one. His fast-paced offensive ideology never really emerged into the dominant style it was in his college days at Oregon. Kelly also had a way about him that rubbed players the wrong way.

One of Kelly's former players, who he cut from the Eagles last off-season, Evan Mathis, finally sounded off on the former Philadelphia head coach. In an email to 9News in Denver, the free-agent let loose on why Kelly may not have been a players coach:

"Two of the main issues that concerned me were: 1. A never-evolving, vanilla offense that forced our own defense to play higher than normal play counts. 2. His impatience with certain personality types even when they were blue-chip talents. The Broncos team I was on would have eaten Chip alive. I don't think he could have handled the plethora of large personalities."

Mathis, who played on the Super Bowl 50 winning Denver Broncos, gives an interesting take that seems to match what other players have previously said about the newly appointed San Francisco 49ers head coach.

Do you think Chip Kelly will ever get a team to buy-in to his philosophy and become a successful head coach in the NFL?