If Harris committed I don't know if Litton would stay committed. It looked like Litton was going to look elsewhere when Flowers committed to us. Flowers left then Litton immediately hopped aboard. I don't think he's a fan of competition, especially from a comparable QB.
I'm not sure I really see any basis for this. What exactly made you think he had scratched USF off the list when Wanky Flowers committed? All indications are the Flowers episode actually sped Litton up on his timeline.
You could say that's because Flowers decommitted, but Flowers isn't really out of the picture even now. He may have pulled off his initial commitment because of his brother, but he's still got USF on the mind and hasn't committed anywhere else.
He intimated "Well that changes things" on twitter once Flowers committed. I wouldn't even call it an intimation. It was rather obvious that he was going to look elsewhere.