The biggest conformation fault I'm seeing w/Leonato is his steep shoulder, which will limit his ability to reach forward for extravagant trot extensions. But everything else indicates a build allowing for moderate to strong collection. I like his very uphill build, great neck, strong back, good strong hindquarters, big low hocks, clean legs, good hooves. He has a nicely active hind end and reaches well under in trot and canter.
He has what looks like a decent walk though he's not being asked for a good forward one. The trot is nice and can only get nicer. Down the road collection should be easy for this horse, but I'd really like to see him being asked for much more forward - not faster - in all gaits (ref. Striker's trainer's vids versus his old owner vids)
For 15K, he's a big young handsome eye-catching guy with 3 good gaits. Great bone, clean legs, barefoot behind which saves $$. He doesn't look to love jumping much from the vid, and looked slightly balky during that endeavor to me. I think the big question is how is his work ethic. I do wonder what he's like to sit on. I am intrigued, for 15K.
I rewatched Moe's vid w/sound on. He forges an awful lot. So cute-looks like a teddy bear, but he is more of a hunter type. Plus he's really huuuge.