From what i heard, he wasnt all that impressed with NUs current recruits and wanted to play where a bunch of "ballers" were going (USC, OSU and Mich). Clearly he is star gazing and probably wouldnt work great with NUs "work to play" system. While i would love to have his talent, his caliber of player has expectations (see A Green) and arent used to working for it. With telnt like his, football comes easy. Again, see Aaron Green's story.
But, i dont want to be butt hurt. USC has a lot of talent and i dont blame him for his choice. Some times things work out for the best, even if its not what you want at the time.