How can it fall at his feet when he says he picks all the players but the QB which he leaves up to the HC so he can get the guy for his system.
He's the GM. If he decides to delegate, that's his choice, but the buck stops with him.
And if you think McNabb was successful in the NFL we have different baselines LOL.
McNabb was a six-time Pro Bowler at QB. I don't know any other definition for his NFL career.