First, I have no idea if he's a "utter egotistical asshole". Never met the guy, and I assume that most people hating on him formed opinion of him by consuming heavily negatively biased sources.

However, I assume he is some type of an "asshole". And "he'd be even more successful" if he wasn't is just very wrong, IMO. From my experience the top of any organization is completely overrun by assholes. Some smart, some dumb, some more moral, some less, but generally assholes. Being an asshole is selected for in hierarchical organizations and simply required. Part of the reason why leftists dream about some socialist utopia, when attempted in practice is ruined by some asshole(s) taking over power and turning the social utopia into totalitarian distopia.