How is that to the point? The baby still has no genetic material from the surrogate.
I don't know if you're just being dull, or you really don't get it. The baby Jesus gets no genetic material from Mary. That zygote of the "last Adam," Jesus, and invested with His Spirit of life, and implanted by the Holy Spirit, is supplied out of the same configured DNA as that which was created for the "first Adam," by the same God Who created Adam's body DNA from the dust of the ground.
Thus, the 'quickening Spirit" of Jesus the Beloved Son was begotten in the flesh by entering that zygote, occupied the exact same type of sinless body material, be born, and grew into an adult human male.
What Jesus was going to show was that God in the flesh could come down from on high, occupy a human body not tainted by original sin, and completely satisfy the will of The Father, thus being the only human to fulfill the Law on behalf of all humanity.