Assuming Musk did take over Twitter, he wouldn't need to be much of a distraction. He could dictate a few rules (don't moderate Twitter, don't ban anyone, etc.) and then leave the company to function as it did before.
Not really. One of the hard things about changing the course of a company is that you actually need people to do the things you want them to do. That means actually being hands on and checking things are getting done. Otherwise people will nod and agree in meetings and then just carry on as they were before. This is especially hard if people are resistant to the changes you want to make.
Taking over and issuing commands doesn't work unless people have nowhere else to go. If Elon tried that at Twitter there would probably be an exodus of engineering and ops people.