To bring light into the darkness.
Was that David's job as king?
A lightbringer would be a priest.
For indeed He does not give aid to angels, but He does give aid to the seed of Abraham. Therefore, in all things He had to be made like His brethren, that He might be a merciful and faithful High Priest in things pertaining to God, to make propitiation for the sins of the people. For in that He Himself has suffered, being tempted, He is able to aid those who are tempted. (Hebrews 2:16-18)
For this Priest to be made like his brethren he would need to have been born of woman. Was your spirit son born of woman to be like his brethren?
If your spirit son could make propitiation for the sins of the people why would he have needed to become lower than the angels? He could have stayed as he was.
Christ's job is to restore the kingdom to Israel and to sit on David's throne forever. Neither Jesus nor your spirit son restored the kingdom and neither is currently sitting on David's throne.
Before Jesus' ascension his disciples asked him if he would then restore the kingdom to Israel and Jesus said it's not time.
So what is your spirit son doing? He's certainly not helping anything.