Yeah, this year could be really interesting for him. I doubt he's really faced any true struggles, other than injury. His body language isn't all that encouraging when he doesn't get the calls he wants or when things go wrong.
His pitches flat out aren't as good as before his injury. He's lost 2-5 mph off the fastball, the curve doesn't bite as much, the changeup is not as controllable. I think he's lost some of his touch, not to mention velocity. Fortunately he's got plenty of velocity to win and he can get his touch back with reps.
He'll be fine assuming he remains healthy,