Trade Rondo plus whatever is necessary (future 1st, Olynyk, Bass, ?) to Orlando for the 4th pick. Orlando needs a PG and is rumored to want Exum with the 4th.
Celtics select Embiid with the 4th pick.
Celtics select Exum or Smart with the 6th pick (by trading with Orlando, we not only secure Embiid, but we eliminate competition for Exum and Smart).
Celtics end up with a good, young PG, with the choice of either Exum or Smart, and a potential (when healthy) franchise center.
CB