1) Paypal was built on Thiel's tech and business acumen. Almost nothing of Elon's startup survived the merger that formed Paypal. Elon's reign as CEO was so disastrous he was fired returning from a business trip following an emergency board meeting scheduled while he was in the air.
2) Jury's still out on Tesla. All of their misfires can be traced to Musk, including their billion-dollar assembly line that couldn't actually assemble anything.
3) Gwynne Shotwell wants a word with you. SpaceX was nothing until she took over day-to-day and it's quite offensive to think that Musk has anything to do with SpaceX's success. SpaceX, noticeably, is the only one of Musk's current ventures where he isn't in charge of day-to-day operations and it's the only one that isn't a comedy of errors.
4) SolarCity was on the verge of bankruptcy. They were saved from immediate death by the Tesla acquisition. Since then, they've gone from being #1 or #2 in the market to a non-player; SolarCity now does less business than the larger regional solar installation companies. They're business is so bad right now that Panasonic is selling almost all of the output (i.e., solar cells) of the Gigafactory 2 in NY to SolarCity's competitors because SolarCity can't handle even a fraction of the supply.
And the sad thing is that Tesla and SolarCity would be doing so much better if Musk weren't in charge...like SpaceX, where he's not.