He also owns less than half of SpaceX. But SpaceX's management is probably just fine with him going off and focusing on Twitter, they can do fine without him playing an active role.

They probably do better when he's not around.

Which reminds me, I've been meaning to keep tabs on his former head of engineering at SpaceX. That guy is probably the one you should be watching, not Musk.

My mistake. He does hold enormous influence though, I would think.