In the NFL, everyone has AMAZING physical talent. What separates teams from 5-11 and 11-5 is coaching. The ability to put that talent in the right place and be utilized properly is the difference. Can we finally squash the debate once and for all. Look what an amazing coaching staff has done for us.
I agree to a point. NFL is a lot like NASCAR -- everything's regulated to make it fair to a point. In NASCAR, the most disciplined team drivers with the best pit crews who know how to shave a hair here make a little lighter there, those are the teams who win.
That said, in the NFL, the difference between the best teams and the worst teams remains talent. Don't know how it could be anything else. Good coaching can only hide so many holes before a team without holes exposes them like a mouthful of rotting teeth. The only thing more important than strong starting talent is quality depth. Or at least contributing depth.
Fans put too much emphasis on things like play calling. They don't put enough emphasis on things like smart receivers who always make the right adjustments on third down to sustain a drive or over-matched right tackles who make every drop step count or third-string running backs who sacrifice their bodies to pick up a blitz or slow back-up safeties who sustain their NFL value by using good instincts and always knowing where they need to be.
Great coaching, IMO, is pretty rare. The number of coaches who could take almost any level of talent and raise them a level or two ... maybe less than 5 percent of all the coaches in the NFL at any given time. One of my favorites was Fritz Schurmur, and his secret was an abundance of pragmatism. He would take his zone schemes and manipulate them each week. But instead of focusing on what parts of the field his defenses need to cover, he would focus on the parts they DIDN'T have to cover. He would find ways where he could cheat a safety two yards inside the hashmark, or cut short a linebacker zone drop a step on 3rd downs to take away (for example) the Jerry Rice slant. There aren't many coaches who can also think in reverse like that.