If you draft a high level big man who is a good athlete and has good skills, why do they sometimes turn out like WCS? Some might say motor. I've never had a problem with WCS's motor when I watched him.
I think it's an essentially Daniel Theis/Al Horford type quality. Being big isn't enough. Being a great athlete isn't enough. Blocking shots isn't enough. Having a decent jumpshot isn't enough. All those things are helpful, but the wide chasm between a player like Theis and WCS is the feel for the game.
Great big men are connected to ball-handlers. They know how screen, switch sides of the screen, short roll, lob roll, fade, rescreen, and pop. When they get the ball, they have a great feel for when to swing it, when to attack, when to shoot, and when to reset with a handoff.
Good big men today function in much the same way as a point guard from 20-30 years ago functioned. They keep the ball moving primarily, but they attack when there is an opening.
That's my trepidation with Wiseman. I don't care about scholarship issues. From what I've watched, I don't think there are motor issues. I like his touch. He's a great athlete. I think he demonstrates a really good feel offensively (when he has the ball) and a pretty good feel defensively. In both of those ways, I think he will be way ahead of where DeAndre Jordan was when he came into the league.
But the difference between Wiseman being worthy of a top 10 pick or not is his feel. There's almost no highlights demonstrating he has the ability to play the modern NBA big man role offensively. That doesn't mean he can't--it just means there isn't much evidence on it.