I ask for terms to be defined because Biblically, these terms can mean different things.
Your theology is based upon the Wt.
You state: He emptied himself of that nature. He was no longer spirit, he took on flesh by coming to be in the womb of Mary.
Therefore, the terms I give you are the Wt terms. Life force from what you speak of is by Wt definition (pg.82 Knowledge book) "life force" is only the breath of man which keeps him alive an does not have any of the characteristics of the creature it animates.
Mondo1: So essentially his mind, his consciousness. Instead of residing in spirit, it came to reside in flesh.
Since spirit beings do not have physical bodies, then they do not have lungs and the need to breath. Further, since you claim nothing of Sons spirit body came down and dwelt in the human body, was the Son still existing in heaven?
With this in mind dont forget what the Knowledge book says on page 109:
"wicked angels took on fleshly bodies." These angels, in bodily form, had relations with women, and children were born. But when the flood came these "rebellious angels escaped destruction by dematerializing their fleshly bodies and returning to the spiritual realm."
Apparently the Wt teaches that it is possible for spirit beings themselves to indwell humans without ceasing to exist or giving up their identity.
Then why I ask you would it be impossible for the Son to come down and dwell in a fleshly body? Isnt that more reasonable then implying that God transferred his life into Mary, while trying to maintain that nothing really came down?