As Penk says keeping our solid back 3 is really important and I would much rather someone who isn't quite ready but plays that position for 60 mins then comes off than someone out of position who cant defend. I don't take the "its only Hull" attitude, its massive game and could even be the one that all but seals promotion if results go our way today.
Phil has had 3 appearances on his way back including 90 mins in his last appearance, I remember Lescott coming back after barely kicking a ball and being out for much longer, it all depends on the individual. Phil is naturally quick so that will solve some of his problems relating to match fitness, its Phil all the way for me with Bennett replacing him when/if he needs to come off.
As for MGW in CM, again having seen him there several times I would worry about his lack of physical presence, hes brilliant further up the pitch but Costa is probably better at tackling and we wouldn't put him in CM. He may have done it for the kids & U23s but its a far less physical/intense level of football. I hope Saiss recovers and can play as hes hugely important to the way we want to play.