I don't think Embiid playing the "4" really matters. He's not going to defend the stretch big man in games unless he switches on screens (a distinct, yet welcomed possibility), so that's not the problem at hand. On offense, he's going to do much like he's already doing: pick and pop, pick and roll, take his man off the dribble, post his man up.
I think this board might be a bit too label crazy. Embiid is going to do whatever the hell he wants to on offense because he can literally do everything. Perhaps forcing the other team's shot blocker, like a Gobert or Whiteside, to defend Embiid on the perimeter is one of his greatest assets. Think about that when a 6'7, or under, defender is being posted up by Ben Simmons with no backside shot blocking. If Embiid being on the perimeter makes him a "4", then he can be a 4. The matchup nightmare other teams will face will be extraordinary regardless. That's why I'm advocating Nerlens getting re-signed and being our starting stretch big man defender. No one is going to stop Embiid, Simmons, and (insert top 2017 draft pick here) on offense. No one is going to take advantage of Embiid and Noel on defense.
Thinking about the Simmons, Noel, Embiid front court has me excited. I loved this tweet today:
Yea, and his lack of rebounding doesn't matter. Embiid and Simmons put up freakish rebound numbers in college. They'll be able to use that ability with our length contesting every shot. Noel will be the big man version of Marcus Smart except he doesn't shoot 5 threes a game.