That being said I think he is being overly underestimated right now. Clearly he can bring something positive based on history.
SpaceX/Tesla employees work as hard as they do because they believe in the mission of the company. They're willing to just buckle down and do amazing things beyond most people.
Twitter had a lot of normal employees, however, it also already had the true believers in the mission. Those people don't seem to have bought Musk's vision and they're leaving the company. He wanted to get just down to those folks, but I think by and large, they're gone. I don't know that he can recover from that mis-step. He needed to come in, explain his vision and got the true believers onboard before he cleaned house IMHO.
He must know this??