I'd like to think Shotwell et. al already have a pretty well established convention as to how much Musk is allowed to intervene directly in operation and decision-making.

He can pretend that he knows better than automotive engineers but I think his self-awareness is better calibrated when it comes to rocketry.

He definitely has a lot of say when it comes to the technical details of rocket design. Mueller told the story about how on Merlin engine he insisted on utilizing fluid Dynamics to control the fuel instead of using valves, when everyone else disagreed, and the idea worked really well. And you know that there is no way Musk can fire Mueller and keep SpaceX so he doesn't need to brown nose Musk.

He can take the CEO slot anytime he wants, but he should not.