If Kaveinga isn't in the MTC this month, then I think he's really shooting himself in the foot as far as football after the mission goes. He's going to be returning relatively late in 2 years to be back in shape.
USC is the school that coerced him out of mission plans (that was Pete Carrolls m.o.) so you really can't blame the kid that at 21, he might not want to go IF he can now play right away.
I believe I'd think twice about the mission if there was a chance to start day 1 this fall, considering his age, the timing, and the need. No one could blame him if he wanted to stay. Not a lot of NFL teams looking to draft 25-26 year old linebackers.
If he's not already gone, then something tells me that there's a story there; I just dont' know what it is.
I don't see how the NCAA would deny him considering he may simply have left when he saw the cheating and writing on the wall, so I dont' think there's any truth to his request being denied (if a request has been made, I have heard nothing)