Warmbloods tend to take longer than others in terms of growing into their legs, I have photos of my current horse as a 3 year old and he had that similar appearance of awkward leg to body proportion because his body had not filled out yet.
However, this horse appears to have delicate pasterns and cannon bones in the front, which can be unsafe for heavy jumping. He also has a small upright shoulder and doesn't have a lot of chest. His hocks are not the greatest either, along with delicate pasterns again. he has a pretty well built wither and back, nothing jumps out at me there. For H/J especially, you would want a longer neck rather than shorter. I would also say his headset is a tad high for jumping but that is a minor detail. I don't know what these people are working on with the horse, but his neck muscling is rather strange.
Last edited by roro; 10-13-2009 at 08:51 PM.