1. Like I said, players swap shirts all the time, I don't see the problem especially as he did it after the game.
2. He was trying to negotiate the best deal for himself, which any worker should try and do. What did you expect him to do, deliberately ask for a low wage?
3. A lot of players have been anonymous in games for us this season. "Putting in a shift" is simply subjective, and in any case I've seen him track back quite well this season.