Landlord
Banned
Good coaches come in and win immediately all of the time. That's what good coaches do. Regardless of what they inherit, let alone when they inherit a consistent .700 winner with the most talented roster in its division.
I agree with the overall thought behind your post, but Bob Stoops, Pete Carroll, Nick Saban, Steve Spurrier (at SCAR), Art Briles, Gary Patterson, and Bill Snyder would be a few who would disagree with this notion.