If you're identifying areas of need, then full back is IMO nowhere near the top of the list.
I'm not sure where this sudden down on BJB comes from. Prior to the high ball he dropped moments after getting a smack on the head in the GF (that lead to the Shenton try) I can't recall too many people questioning his credentials as Webb's heir apparent.
Hardaker looked more dangerous at Featherstone playing full back than he did on the wing for them IMO. He's very dangerous in open field, with deceptive pace and strength making him a real threat on kick returns.