I like the sound of that. Players that dig deep and try to up their game when we go behind are always a good thing.Yes, when I saw him play against Huddersfield (another game Crystal Palace lost) he did moan quite a bit but you could tell it was because he hates to lose. He also worked a lot harder when they were losing, I was impressed with his determination.
The bitching and moaning we can easily cut out if it becomes a problem. What will be telling is how he reacts from going from the star player to someone who has to fight to even get into the team. Sounds like he should push on and work hard once he joins.