Sam Lynch, in the Banner post everyone should read:
To understand why Joe Banner is leaving, in my view, you have to understand what he became after the 2006 CBA. Like I said earlier, the new question in the NFL was whether a player was worth the price he was asking for. It was now all about putting the right dollar value on the available guys.
Of course, this had always been a critical part of the process. Now, however, it was an unusually large part. And Banner had a view on what a player was worth. Think about that for a second, though. Valuing talent is what you would want the GM types to do — this guy is good, this guy isn’t. What Banner should be doing is figuring out how to fit as much of the good players under his cap as possible, not figuring out what the guys are worth.
Just to add a relatively random point, the Banner-Roseman mentorship is probably a good case study for not promoting your natural replacement quite so quickly.