Didn't Farrell deputise as captain a good few years ago v Hull(?) and get sin-binned? Not the most auspicious start to his captain-ship
As someone said previously, Faz's not much of a talker or shouter, Bateman might not have the coolest of heads to take it on and Powell would be best concentrating on his game.
For me, I'd give it to Hardaker - yes he's had his years of being an absolute nob-jockey - but I think he's really settled down at Wigan and matured over the past few seasons, seems to be well liked and respected by other players and got bags of experience.