“What person X experiences is experienced by X’s gandhabba (mental body).”
That which makes experiencing possible is the gandhabba,not the reverse. Otherwise one’s body wouldn’t perish once the gandhabba leaves it.
OR: gandhabba makes experiencing possible as much as the body of flesh of a person with its sense doors.
If we all come from brahmas then subtle engendering gross prevails upon the reverse , only afterwards gross has the possibility of engendering the subtle through Dhamma, til Nibanna.