The Jags owner regrets having fired Coughlin.<quoted text>
No, the playbook, itself, is. It doesn't matter what plays I call if they are all bad plays.
The greatest football minds that shaped the NFL into the league it is today, changed the way the game was played by creating new plays that had not been (successfully) tried before them. And that goes all the way back to the invention of the forward pass, the quarterback position, zone defenses, and read offenses. Take all that out, and it doesn't matter what plays you call. You will still lose.
Coughlin had the same problems in Jacksonville, and later, in NY.
We are talking about the job Coughlin is doing TODAY with the Giants, not what he did ten years ago with another team.
Lots of coaches have more success with one team, than another. Especially those who are approaching retirement age. Landry and Shula both had great success earlier in their careers, but not so much at the end.
All HCs have problems with aging players and injuries. That's part of the job. It's not an excuse to underperform.
Part of an HCs job is to make adjustments to compensate for those type contingencies. The best ones do, year in and year out, and keep rolling. Coughlin hits a wall at about seven years with a team where he is no longer effective. It's time for him to find a new project.
A star player? The entire team was fed up with him. There's being tough and demanding, and then there's going way overboard and just being a jerk. He's been "counseled" several times by players and managers to take it down a few notches. He's made some adjustments to his coaching style, but I don't think he's ever going to really change. He is who he is.