Fair points. I like McDermott. A lot. I think he can, and will, be a great and successful coach - and I think he'll do that with the Bills. Situational play calling on offense is my biggest concern. What I don't know is whether it's all Daboll, or if McDermott has a hand in it, as well. But as the head coach, he is overall responsible.
Game day roster management is my only other significant concern. Specifically - Gore should have been shelved the final third of the season and Duke should have been active in WAY more games. Activating him for a playoff game, then making him a significant part of the offense that day ... I'm still scratching my head.
And to get this back on topic - Knox as misused and overused; especially when they had other options at TE. I love Knox and think he's gonna be great. But he was not great last year. It was clear what he could do well and what he could not do well. They (Daboll and/or McDermott) continued to force him into situations in which he'd not been doing well. Another head scratcher.