Yep he has massive hands for his size. I believe Gus Johnson said during the Cotton Bowl that they're like 10.5 inches, which is just a little bigger than mine and I'm 6'5 with pretty big hands. Pretty crazy. Plus, like you said, the size 15 shoes. Sounds like he's due for a growth spurt. I didn't finish growing until 22, I'm sure he could still grow another inch or two in the next couple years.