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Again, form is form. We don’t have immaterial form and material form. There are two things involved in any thing, substance which allows that a thing has specific form which these together allows the thing a specific function. There exist not anything without form or substance. I think this is parallel to Aristotle’s thought. There is nothing left. I don’t know why Thomas change the idea.In the case of the soul and body, each rational soul is uniquely suited to that body, making it unique from another soul. The soul is an incomplete immaterial substance and the the intellect has no operation in common with the body.
Summa Contra Gentiles 2, 69:
[6] Concerning the fifth argument, let it be said that because the soul is in its substance the form of the body, it does not follow that every operation of the soul must be performed by means of the body, so that every power of the soul will be the act of a bodily thing. For we have already proved that the human soul is not a form wholly embedded in matter, but among all other forms occupies a most exalted place above matter. That is why it can produce an operation without the body, as being operationally independent of the body; since neither is it existentially dependent on the body.