Robert Williams has the size and the foot speed to play the position for us...
It's time to play the kid... He just needs actual in-game experience "as a guy we are relying on."
To me when he plays he is trying to hard not to get benched - has him thinking too much and looking over his shoulder all the dang on time... Just let him go and let's live with it. He'll be fine.
I believe he can do it.
He does have the size and foot speed. If only he knew how to play basketball.
He needs reps, work on his body (in particular so he can get in a defensive stance consistently - I suspect that he favors his knees), and some kind of reliable jump shot (even if it’s not from the arc).
I think he’s got an excellent feel for the game, sees the floor, is team-oriented and coachable. And most importantly he’s a worker.
So I can go along with your assessment to a point; I’d say that it looks like he can learn what he doesn’t know.