Tacko would be as ineffective as Thompson and Theis were in the last game. Embiid wasn't going over Thompson and Theis nearly as much as he was just going through them on offense and rebounding. He'd just go right through Tacko too.
as someone else mentioned, we'd be better off denying him the ball as long as possible to cut his time to make a move. other than that, we really could use a solid body at center that Embiid can't push around (Baynes, Kanter as recent examples). Of course, Embiid is quick enough to get around those bigger players unfortunately.