He got more PT than most freshman and was set to be a main player on defense as a sophomore. Lynch's issue was geography. South Bend wasn't in Florida.
Keil is a matter of playing time. He's behind a guy with three more years eligibility, and no matter how well he does, it would be hard to jusify benching a kid who lead you to a 12-0 season and a BCS championship game appearance. And there's Malik Zaire right behind him. Gunner wants to play, and for more than just one year, I would assume. He didn't seem unhappy at ND, like Lynch was.
This seems more like a Zach Frazer situation, than an Aaron Lynch (or Demetrius Jones).
I'm not surprised. I am surprised that the list of possible destination schools are not bigger programs. And they ARE close to his home, so maybe he's still not ready to be too far away from the family.