Kate, on a young horse I would WAY rather see the shadow of a few ribs than see rolls of fat which are so common to see. (edited to add: of course, what I would *most* prefer is the horse just *about* to show a few ribs but not actually doing so
)
He seems to be growing into his neck, which is a good thing as it was awfully long in the earlier pictures. I still cannot possibly see his back as long... actually I'd say it's just about exactly what you want for something that will jump, could even absorb a teensy bit *more* length for big fences.
I still don't like his lower legs though. His hooves are still awfully far out in front of his cannons, and IMO that is a structure issue not a trimming error. (Not that I am impressed with how he seems to be trimmed). His knees and hocks are rather high and he is rather light of bone below them and just looks like a suspensory problem waiting to happen.
I don't like how his hind feet toe out from (apparently) the fetlocks... but I would not place too much credence on photos shot with him stood up just once, and all hairy at that. If he toes out like that from the stifles, he may be relatively ok, power and soundness wise, but if he toes out more at the toes than at the stifles then I would profoundly not consider him for an athletic career unless you own stock in pharmaceutical companies (and of course, not even then).
Other than that, his hind end doesn't bother me *too* much unless you are looking for something to do The Serious Big Jumpers with, and personally I would not aim him for that just because of soundness prospects (I don't think it's fair to the horse -- and while *some* upper level jumpers with crappy legs can be kept going with careful management and medical expenditures, MOST can't and I just don't think it's nice to toast most of 'em just to find the few that you can soldier on with).
Didn't watch the video b/c am on dialup and don't have all morning ;P I wouldn't worry about winging, or a *small* amount of dishing, in front (assuming you want a jumper not a show hunter of course). To me, straight *hind end* movement is a more important predictor of Can he get over the fence and Will he stay reasonably sound while doing it repeatedly.
I'd take him as a freebie to train but I wouldn't pay money unless I just looooved his personality and cute nosie and wanted a lifelong buddy no matter what he could -- or couldn't -- soundly do. Which does not sound like what you're shopping for. Sorry,
JMHO,
Pat