Wade Phillips, BY FAR. The others deserved exactly what they got, from poor drafts to poor play against good teams!
Eric Moulds is my second choice. HE NEVER got a QB worthy of his talent level except Bledsoe for one good season as the second greatest WR to ever wear the Bills uniform, and that includes James Lofton. IMHO Eric Moulds would have been a Hall of Famer on any good team while he played.