Hi Carlos, thanx for posting the link. It's a great article!
The comparison you made of Kei and Rafa is very interesting and I totally agree.
As for him being successful because he listens to what his coaches say, I think your view is based on the Deuce magazine article, and I guess it is not wrong.
But it seems that was not always the case, or there were times when he didn't like what the coaches told him to do, from what I read in some of his interviews or articles in Japanese.
Kei has said many times that he doesn't like to hit the same shot twice, that he loves changing strokes, pace, angles, etc. He finds it fun for himself and he seems to think that it would make the match more fun for spectators as well. He also prefers hitting a flashy shot when he can, even when that is not absolutely necessary.
But apparently there was a time when he made a lot of UEs by trying to hit those flashy shots, and he wasn't very happy that his coach told him to just put the ball in court. Apparently it took some time before he finally understood the importance of putting the ball in court first and not always trying to hit a fancy shot. Having said that, I don't think he was being blatantly rebellious against his coach. I think he did listen to what the coach said, only that he didn't find it fun at first just putting the ball back in court.
Anyway, thanks again for a very insightful article. And let's hope the Project 45 will be replaced by Project 20 or Project 10 very soon!