You just cannot pass on the chance to draft a superstar, at any position. they are the rarest of rare breeds. I would have real questions whether Reke and Wall would work together, would much rather it was Hakeem waiting there to be drafted than Wall. But that said, you just can't pass on a unique uber talent. Its not as if Reke is the purest fo PGs anyway -- we actually have used Beno at times as a starter next to him. So you draft Wall, you team the two, and if things click (and I said this even last fall before we saw Wall in college) you could literally, no exaggeration, be talking about one of the best backcourts ever put together. You have two passers, two unstoppable to the rim guys, two great defenders, and two perennial All Star type talents. It could be an epic pairing.
Now do I guarantee how that works? No. Both guys want to have the ball. Shooting is the weakness for both at this point. But it would be as physically, defensively, offensively forceful a dominant pairing as you could put together. And at 20/21 if it worked you would be a great team forever. A dozen years at least. When you see a talent like that sitting there, you toss that position stuff right out the door and you draft the potential superstar and see if it works.