Okay, you just explained to me why WWE should push Barrett, but not why the other members of Nexus should follow him. Basically, what do they get out of taking orders from Barrett? Why can't they impeach him and go about their own business. It's not like jumping every superstar that gets in their way takes that much planning.
nope there were reasons why they'd follow him in there.
He won NXT, so he has their respect (remember how they all said he should win in the finale) and something to prove his superiority if tested, and because he's the man with a plan they'll follow him because he knows what he's doing and comparatively they don't.