Richard Horne for me.
OK he played most games at 6 but IMO he was a FB should have played FB for Hull.... we should have kept Brough and signed a 6 from the NRL. Then Cooke could have carried on playing at 13, earned a GB call up and we would have beaten the aussies. But this didn't happen (not that I ever think about it)... so Shaul is the best FB