Which three? Cause Tesla wasn't founded by him, neither was Twitter.
I don't know what "found the Tesla as it exists now" means. Founding and leading are distinct. Musk has been a key leader at Tesla; he was not a founder of it or any merged or acquired company.
If you want to showcase a company he unambiguously founded which is unambiguously successful, why wouldn't you pick SpaceX?
You took a lot of words to agree that Musk didn't found Tesla. That other stuff would better be argued with someone else who is disputing it, because the person you replied to was talking about founding companies.