The plan would have worked, if Gawain wasn't part of the team.
Gawain is one of the biggest *beep* I've ever seen in a Coen Bros. movie. He gets fired from his job, so he's worthless as an inside man, he constantly works against the gang, getting in childish fights with Garth, and so on.
Professor Dorr should have been smart enough to get rid of Gawain after the whole job incident. Then the plan might have worked!
But what sort of movie would it have been if the gang actually made it?
xD