I think it's pretty clear that the only department Bellew might have a possible advantage over Haye is stamina. Bellew has been far more active and has been in some wars, Haye hasn't been a proper fight for years... If Bellew can somehow take this fight into the second half and then put his foot on the gas when he sees Haye gassing out, it will one hell of a feat. I've got a feeling his emotions will just take over and he'll look to stand and trade in which case he will come out the worst of the two..