I'm more concerned about his injuries than his behaviour.
I'm sure his contract is loaded with causes about his off field antics, and it's only 1 year so he will have to impress to earn a new contract. Plus in a team that actually has a chance of winning something he will surely be much more motivated, and to top it off he'll be playing behind a pack that more often than not is on top.
As long as he keeps fit I'm very optimistic about this.