On the companies I had a look at, vanguard + blackrock is usually ~30% and both are usually the biggest share holders.
For instance, amazon, vanguard + blackrock are not in control because, one, there is the azur fund which has a bigger part, two, JB has a massive part of the shares, JB is explicitely in control here.
What I could read from the net vanguard and blackrock are still small in tesla compared to musk, so until he sells to them most of his shares, he is still the capitain on board. In the end, we cannot tell if musk is one of them.