Hmmmmm i don't think so. There is not enough credit given to Nanami Abe, seriously. Yuzuru had a flip (!) not a lip, he had already his magnificient 3A and a pretty solid 4T, was landing 4S in practice. Yuzuru still fall a lot with Brian Orser. I don't see what he repaired on Javier's jumps. Talking about Junhwan, his 3A still really bad. Maybe Orser teach him his 4S.
And i was talking about jumps especially.
Actually people give her plenty of credit, as already mentioned above, as well as for knowing when it's the right time for a student to move on because they have taken them as far as they can go. She was a fantastic coach for Yuzuru.
Again, as others have said, Brian and his team stabilized the 4S in competition and that was Yuzuru's stated goal for moving to Brian. He saw what being with Brian had done for Javi's Sal. I hope we can agree that Yuzuru is a smart competitor and can be relied on for assessing a positive change in his rival.
Let's also not forget that Yuzuru learned the 4L and 4Lz under Orser as well and have landed both in competition.
Oh, and the Yuzuru "still fall a lot" claim begs to be explored with data: http://the-real-xmonster.tumblr.com/post/166583644404/in-the-course-of-collecting-data-for-a-bizarre
(Note that the data does not include anything from the 2017-2018 season and that reading the notes below is instructive)
For those who don't want to look at the link, guess which skater has the highest average success rate on landing quads in competition? Yuzuru Hanyu. Who has the best success rate on 4S? Yuzuru and then Javi (for the latter read the accompanying note for context). If you know how difficult quad jumps are, you'll realize that "falling a lot" happens to all of the top men. So I don't think that can be used as evidence that Brian's and Ghislain's skills in the jump department are lacking.

