O'Carroll has improved in that he always took the up the ball strongly but used to get knocked around in the tackle ending up on his back and with a slow ptb.
That wasn't so v Hudds, he's now quickly off the floor and that matters.
He's another that appears to have improved his performace with better training.

If he wants to play for England i think he'll not be able to turn out for Ireland for 3 years then he can 'switch'

Another reason we should stay as Great Britain until Ireland/Wales are anything like.