Here's a youtube highlight on Yaak Yaak. Has a nice touch in the paint w/range..
...out to the 3pt line. Hard to say from one video where he would fit in at BYU, definitely a 5 with some rim protection ability but not sure if he could switch and defend smaller players on the perimeter or not (pair as a 4 alongside Khalifa or Fouss). The highlight video only shows him taking one 3pt shot and it was off of an inside out or ball reversal (can't remember which) so he was wide open and not rushed but his shot looked nice. His game looks like it's still in the developing stage (seems a little mechanical/robotic) and doesn't have a big arsenal of moves but uses his length well to get into scoring areas and shows a nice soft touch in the paint.