[KSA]

I think this commentary from John Gill will add to our discussion:

...now he is made "a quickening spirit"; which some understand of the Holy Spirit, which filled the human nature of Christ, raised him from the dead, and will quicken our mortal bodies at the last day; others of the divine nature of Christ, to which his flesh, or human nature, was united; and which gave life, rigour, and virtue, to all his actions and sufferings, as man; and by which he was quickened, when put to death in the flesh, and by which he will quicken others another day: though rather I think it is to be understood of his spiritual body, of his body, not as it was made of the virgin, for that was a natural, or an animal one; it was conceived and bred, and born as animal bodies are; it grew and increased, and was nourished with meat and drink, and sleep and rest; and was subject to infirmities, and to death itself, as our bodies be; but it is to be understood of it as raised from the dead, when it was made a spiritual body, for which reason it is called a "spirit": not that it was changed into a spirit, for it still remained flesh and blood; but because it was no more supported in an animal way; nor subject to those weaknesses that animal bodies are, but lives as spirits, or angels do; and a quickening one, not only because it has life itself, but because by virtue of the saints' union to it, as it subsists in the divine person of the Son of God, their bodies will be quickened at the last day, and made like unto it, spiritual bodies; also because he lives in his body as a spiritual one, they shall live in theirs as spiritual ones: and so the apostle shows, that there is a spiritual, as well as an animal body; that as the first man's body, even before the fall, was an animal or natural one; the last Adam's body upon his resurrection is a spiritual and life giving one, as the Syriac version renders it...