Rebounding is going to be a concern and, yep, you (and someone in the game thread) are right about Wemby leaking out on the fast break instead of hitting the defensive glass. I expect Popovich to change this, as that's pretty much the opposite of his philosophy. However... those hit-aheads with Wemby going deep are almost always automatic scores.
That said, the Sochan-Wemby-Collins front line is more anemic on the glass than I'd like. This will be something the team needs to figure out.
I pretty much see Victor as a SF at this point, or a stretch PF. It's a fluid thing nowadays, but where he likes to see the ball is perimeter-oriented, often the wing, although he loves that straight-on three. Will be fascinating to see him next to Sochan and others.