Something to consider...
Every company Musk has been involved with that has been successful, was successful before he got ahold of it. He just gave them more money.
The one company he's had complete control over, he's driven it into the ground, takena thriving social media site and driven off the users, the advertisers, and anyone that might want to invest...
The others, he's a ceo, but they just pay him lipservice, and don't let him meddle too much.