You’re saying the same thing as GP. Let me attempt to clarify.
What GP is saying is not that Rick Rubin has no skill anywhere, but that he recognized he has 100/100 taste and instead of trying to become a hip hop artist, instead became a producer for other artists.
In the same way, you’ve described how Bill Belichick recognized his taste in what makes a player good is not enough to make him also a good player, so he positioned himself to take advantage of his 100/100 taste rather than whatever skill value he may have.
It’s weird to frame Belicheck as a talent picker first. Yes, he had a lot of control but he was a coach first, not a GM. The thing that made him extraordinary was not identifying talent it was orchestrating a team system to take advantage of individual talents. Compared to other coaches that had one system and tried to fit players rigidly into it, Belicheck was master of adapting the system to the personnel. Of course he also had Brady and a lot of control on personnel, but it’s ridiculous to speak as if it was primarily his taste that made the Patriots great.