All I can say is that based on what I was told before the season, they were expecting to bring in 8 new players. Now you see why. 8 are gone already (Juzang was poached so that wasn't expected but happens). They had 3 open scholarships. Sestina was going to be gone. Nick/Maxey/Whitney were all expected to go prior to season with Whitney's departure being for different reason then expected. Throw in Hagans of the guys who were likely to leave as well.
EJ/Quickley were the on the fence guys prior to year and Quickley played himself into the POY in the Conference. EJ Montgomery decided to lie to himself about his ability when returning "I'd have been a 1st Rounder if I came out" talk. He played to a level that has many thinking he's not on even on the board of teams in a universally maligned/panned Draft class. Not sure you want that back, but I get it if it makes you feel better that he would want to come back. He's shown no clue of what it takes to be a good college player let alone a Pro. To me if a player that approaches his career that way doesn't want to return, not expecting anything if he were to come back.
Quickley returning would be the boost next year's team needs because he's performed, he works, and has a personality that fits in with a team. If EJ joined him, he'd need to be held to a standard he's shown he can't achieve to this point. Would he? We'll see.