I know, it took me a few days to post, too!
I am guessing Jason works on jumps mostly with Karen Preston, who is his third listed coach. I haven’t heard anything about Ghislain, and at 4CC I didn’t see him at the boards for Jason (in contrast, he was there for Jun and Yuzu).
@bookseller, I am not sure top six at Worlds would be much pressure for Jason so don’t let it make you anxious! I agree with Ross74 that he wasn’t too happy at popping the quad, so I’d guess improving that will be a big focus. I don’t see him worrying much about maintaining 3 spots. It’s true he’s a team player, but since Nathan is highly unlikely to place lower than second, Jason/Vincent can still place as low as 11th. I think the challenge for Jason right now is to focus on reaching his own full potential, which to me starts with landing a quad in competition. Beyond that I think it means being able to see himself simultaneously as a very nice, loving person and as someone who is potentially competitive at a World level. JMO, but when you win or push for the top you need a certain ruthless quality - because ultimately if you win, someone else loses. I don’t think Jason is in any danger of winning worlds this year, and he’s pretty much a long shot to medal. But I do think that in order to get there, he’s got some work to do mentally.