@rodhilton as a skeptic I'd like to see evidence before jumping to conclusions.

I also thought Musk was brilliant because of Tesla and SpaceX. Now that I see his ridiculous performance at Twitter I see 2 possibilities:
1) he's not really that smart. It was all just great PR.
2) he's out of his depths with Twitter, thinking to himself "it doesn't take a rocket scientist, ehm, to run a social media platform" - but still brilliant otherwise.

How do I know it's (1) and not (2)?