Mavric
Yoda
I also have no confidence in Sims, both drives he's been in since coming back have been incredibly disjointed and that reflects on him. But FWIW there's no way the not snapping the ball when a DL is in the neutral zone is on the QB - either the OL across from him needs to touch him or the center needs to snap it. There's not time to wait for a call for the ball to snap it, and sounds like Rhule expected the Guard or Tackle to draw the penalty.
Both of those can happen as well. But the QB can also call for the snap.
Judging by the "discussion" Rhule was having with Sims after that play, I don't think he was blaming the center.