It's an awkward structure to have the executive chairman and/or majority shareholder take a position (usually CTO or CPO) elsewhere in the org chart, because it means that that person is simultaneously the boss and subordinate of the CEO.
It can work - most famously, this was the structure that Google had in its golden years (2001-2011) with Eric as CEO and Larry & Sergey as presidents of Product & Technology, respectively. It also was sort of the structure of Apple with Steve Wozniak as an IC & founder. But it puts the CEO in a very awkward spot where they're in charge of the organization but not really in charge of the organization, which in turn requires leadership with great humility. That's not really what Elon is known for.
The structure of SpaceX or Facebook or Apple 1998+, where you have a visionary CEO and then strong COO under them that makes the trains run on time, is much more common and less fraught with conflicting reporting lines.
It can work - most famously, this was the structure that Google had in its golden years (2001-2011) with Eric as CEO and Larry & Sergey as presidents of Product & Technology, respectively. It also was sort of the structure of Apple with Steve Wozniak as an IC & founder. But it puts the CEO in a very awkward spot where they're in charge of the organization but not really in charge of the organization, which in turn requires leadership with great humility. That's not really what Elon is known for.
The structure of SpaceX or Facebook or Apple 1998+, where you have a visionary CEO and then strong COO under them that makes the trains run on time, is much more common and less fraught with conflicting reporting lines.