What I get from this... He was snapping off majors with a conventional shaft.
Not for 3 years, he won nothing. He was in a drought. Or players were just getting better and passed him by. who knows. Nobody thinks it was 100% the shaft. I'm sure he had to dedicate himself more, concentrate more, and practice more. But, on certain shots, he no longer lost focus or confidence. That's a win in anybody's book. The game is hard enough to play let alone have your confidence fade when you need it the most