I don't think "which seat you occupy" governs who the aircraft commander is
US Army flying Huey slicks it was the norm for the AC to sit in the left hand seat, the only reason as to why I heard was that the instrument panel on that side didn't stretch right across the cockpit so giving a better view in the downwards direction, booby traps come to mind but never mentioned, personally I preferred the right seat as you had more convenient access to everything, it was the designed command seat after all. As a humble Leut once had an Air Commodore as a copilot for a day of combat.