Given he was forced to follow up on the deal or face a market manipulation lawsuit, my personal opinion is that Musk wanted to work directly hands-on on Twitter's direction, overestimating his knowledge and know-how from the early dotcom. Given thefame he got from SpaceX and Tesla he seems to have fallen victim of his own illusory superiority. It's just a website right? For the matter I really have my doubts of him being able to personally code review a modern complex stack).

This is the only difference I spot, meaning no one was oversighting his internal management of the company. His inputs went live into operations as if they were tweets.