Ego state CAN take over, but main person usu knows, or soon figgers it out cuz monotoring system will sense that all is not right sometimes and so it can be modified to appear more normal.
This is where its NOT DID in my opinion. Cuz DID they don't know. They have blankouts for longer periods of time, they are not notified of changes.
Much harder for did I think than for split. like me.
Ego states can be quite complex too. They are like ages, kids, and adults, and stuff. To me its is emots I mostly notice, not some much actual voices(cepting screaming sometimes-too loud).
But one ego can have all emots, not just one. They can be happy or sad or scared, or angry, or just crazy in head, but other egos can be OK at same time and maintain control.
ALL people can do this I think.
People who stay calm while a crisis is ahppeneing are splitting. They putting freaky part away and just dealing w/situ. They are splitting. ANYbody can split.
Thats what I think.
Feels good to say it.
Thank you.