He's defiantly the most ball greedy hooker in superleague but he does add a threat we don't carry already.
I think we'd be sensible to stick with what we have though for next season in the halves/hooking positions. We've got two players in the halves who like to take the line on and a skilful outside back line with a full back in Escare or Tomkins who should make things happen. It would seem a sensible option to feed that line up the ball as often as possible with the expectation that they'll make things happen.
Also to cut Powell's game time after the season he's just had (which is what you imagine would happen should Dwyer come in) wouldn't feel right for me. He's earned his place.