Bannon didn't much question Donald Trump's bona fides, or behavior, or electability, because, in part, Trump was just his latest rich man. The rich man is a fixed fact, which you have to accept and deal with in an entrepreneurial world--at least a lower-level entrepreneurial world. And, of course, if Trump had had firmer bona fides, better behavior, and clear electability, Bannon would not have had his chance.