I really think there is a good shot Drummond stays if there is no postseason ban. He would have been without question the #1 pick in the 2013 draft, and with the way he talked throughout the season about returning, clearly it was something that wasn't out of the realm of possibility.
If we were to take Roscoe at his word that the postseason ban had no baring on his transfer, then maybe he still doesn't return. With Oriakhi, though, who knows? On one hand, it's possible that his relationships with the players and coaching staff were fractured to the point that him coming back wasn't a viable option. But then what else would he have done? He's not going to sit out a season to play somewhere for one year. Does he enter the draft? Between him and Andre, I get the feeling at least one of them returns, which at the very least would have mitigated our biggest weakness that season (rebounding). Were that the case, we definitely would have had at least a shot at making a deep tournament run, but the tournament is unpredictable and Boatright wasn't near the same defensive player last season he would later become. I like the way things turned out.