It makes perfect sense in the sense that he already redshirted, so sitting out ANOTHER year would really suck for him.
Remember, this kid was a stud coming out of high school. SC fans foolishly said that he would be better than Clausen, that they got the better QB, that the real evaluators in SoCal has Corp rated higher, that Carroll really wanted Corp, not Clausen, blah blah blah. They look absolutely stupid now.
Oh, and after he had ONE bad game, they started calling him Aaron "Corpse" and completely turned on him. Granted, he looked HORRIBLE in that game, but still, bunch of pricks those fans were the way they turned on him.
It was the best thing for him to leave. Petey has a major league bromance going on with Barkley (to the point that a reporter out here actually asked Poodle if he had a crush on him LOL), so Corp had to leave. Think about it...he and Mustain were entering their 3rd year in the program, and Poodle moved Barkley past them after 15-20 practices. When Corp got injured Petey gladly moved Barkley ahead of him. Those 2 guys will never move ahead of Petey's love-child.
I've always liked Corp, especially when he was at OLu h.s. out here in Socal. He got screwed in the sense that he was a starter and lost his job because of injury. And by the way, he lost his job to the QB THAT HAD THE MOST INT's IN THE HISTORY OF PETE'S TEAMS AT usc. Apparently, INTs are OK for Barkley. Whatever. I wish Corp well...