You’re welcome Maurin! I’m glad Mercygate and I could help a bit.
As to the above statement. . .it is crucial when dealing with the principle of non-contradiction that we include “at the same time and in the same respect”. Otherwise MANY things would violate the principle (and it wouldn’t be a principle at all). For instance a light bulb cannot be both on and off. It has to be one or the other. But it could be on at one time and off at another time. Thus the princple adds “at the same time”.
Another example: Can I be both a poor man and a rich man? At different times? YES. At the same time? YES. At the same time and in the same respect? NO. I can be poor in respect to Bill Gates and rich in respect to a third-world countryman.
As applied to my statement about Christ. . .it is dogmatic that Christ is both fully human and fully Divine. But these are not mutually exclusive of each other. He is Divine with respect to (or when viewed under) His Divine Nature, and He is human with respect to (or when viewed under) His human nature.
Hmmm. I suppose we could answer like Aquinas often answers: Sic et non. Yes and no.

(not a violation of the principle of non-contradiction though. . .because yes in one respect no in another

)
No, in that I don’t think there is really such a thing as an opposite nature. . . since nature describes the powers that a being has. And I’m not sure what “opposite” powers would be. For instance our Human nature contains the nutritive power (the power to eat and grow). What would the opposite of that be?
But in another sense Yes, human nature is as opposite to the Divine nature as you can get. . .in fact any part of creation is “opposite” the Divine nature because all creation is contigent being, whereas the Divine nature is non-contingent and eternally exists and contains its own principle of being within itself. In that sense we and all creation are mostly made up of “non-being” and are only held in being by God’s will.
What do you think?
VC