[fastball]

One of the three he certainly wasn't important as a source of money (X/PayPal), as that is where he got the seed money for the other ventures you are diminishing his involvement in.

For Tesla he was an original source of money but has also been the CEO since 2008 (the same year they began production of the original roadster). So all the things people know Tesla for today (and have made it a hugely valuable company) happened under his direct leadership as CEO.

For SpaceX the idea that he is just a source of money is clearly ludicrous, given that it is entirely his brainchild. Since founding the company, he has done an excellent job of hiring all the right people that have made the company what it is today, and is clearly leading the vision and focus of the company.