Barnett has the ground advantage & Cormier evidently has the standup, however they are both relatively strong in their "weaker" areas (Barnett is not bad with his striking and Cormier's wrestling is 2nd to none). I think Barnett will sub him however he needs to be extremely weary of those jackhammers Cormier swings about.
Should Cormier win this then he has to come straight over to the UFC and fight a top 5 guy, if Barnett wins then i dont know what Dana will do. My gut says he'll give him a shot against a top 5 in the hopes he gets smashed.