McGinley should get plenty of credit too.
He put a lot into helping his team to perform by getting dozens of small decisions right.
To give an example, he understood that Graeme McDowell would make a "great mentor" (writing a note to that effect beside his name a couple of years ago) because of his personality.
He therefore paired McDowell with Victor Dubuisson, who was a guy some players might have struggled to gel with. Whether it was the pairing of other factors, Dubuisson played some of the best golf of his life.
Generating team spirit and giving the team a roadmap to victory is under-rated.
Watson's approach was very poor and looked likely to be very poor from a long way out.
The Ryder Cup captain is about as important as a caddie - so call him a 5-10% influencer of the result.
In other words, at elite level, a huge factor.