Forget talent. Talent is not what matters.Bill is the greatest coach I've ever seen, and I'm happier than a pig in slop that he's ours, but he's still just the coach.
Let me repeat myself here. Who or what determines talent? It certainly isn't the draft.
what matters is performance.
Ask "who or what determines performance?" and then seriously consider how much coaching matters to performance, compared to talent.
Here's an example. Everybody's got a Bill Belichick story:
“Nice block, Gonzalez.” He looked back, and there was no hint of a smile on Belichick’s face. Bill Belichick just kept looking at the field, and in that moment Tony Gonzalez understood. The man had coached him into blocking on special teams in the Pro Bowl.