Candide is the only dude to win X-games big air, slopestyle and pipe and then go on to win the Red Bull linecatcher and freeride world tour overall title and if his most recent edits are any indication, he's not slowing down. At all.
TJ was/is an incredible skier and was one of my favourites for a long time, but I haven' seen much from him in the last few years. I also haven't really been paying a lot of attention, so there's that. Same deal with Rory.
I'd love to see more from these guys, but the fact of the matter is even if they came back hard, both of their comebacks combined wouldn't be as significant as the comeback Candide seems to be making.
(I really don't know about any of the other guys)