I agree with you in part (I was saying “Jesus, Paul, and the Apostles said….” because that was Y1’s normal argument….just having a little fun
).
I agree with the passage that you provide, and I agree with the commentary that you give for that passage. Jesus is indeed fully God and fully man.
Where I think that I may disagree is that I believe Jesus took upon himself humanity in it’s fullest form (both physical and having a human nature – that is, a nature tempted by the desires of the flesh). The reason I say this is that Scripture informs us that Jesus was not only tempted but that he had a will (a will of the flesh) that desired something contrary to what the Father willed (that Jesus did not desire to be beaten and crucified, even to the extent that He prayed if it were possible for such to pass). The difference, I believe, was not in the nature but in the will. Jesus submitted His will to the will of the Father.
Adam had a human nature as well. And without a “fallen nature” Adam sinned against God (that first sin). The only thing that Scripture says changed in Adam and Eve was that their “eyes were opened” so that they had a knowledge of good and evil as God has a knowledge of good and evil. Nowhere does Scripture present Adam as being given a nature contrary to the nature with which he was born. And nowhere does Scripture present the descendants of Adam as having a nature contrary to Adam’s nature. I suggest that this is the meaning of the Incarnation – that God became man, Jesus emptied Himself and was born in the likeness of men, was tempted in all points as we are yet without sin, and can sympathize with our state because He took this state upon Himself. I think this necessary as a high priest is chosen not from some “unfallen” type of man but from fallen men to represent the men of whose nature he shares. Likewise our High Priest was chosen from men, sharing our infirmities, bearing our sins.