We don't think the NT supplants, supersedes, or replaces the OT. (And of course, we do not consider the Koran or the Book of Mormon to be bona fide “Scripture”.) But the OT is still studied and read in public and private worship.
A traditional Catholic thing to say is that the NT is concealed in the OT, while the OT is revealed, explained, interpreted by/through/with the NT.
From our (Catholic) POV the Incarnation, the whole “Work of Christ” is HUGE! It sets the Universe, all creation, on its ear. The Creator becomes a creature and, as we sing in the Te Deum, humbles himself to be born of a Virgin.
Further, one aspect of this is that now the “perfect” (which has at least to mean “adequate” or “sufficient”) revelation of God to man, of Creator to (allegedly) rational creature is not a book but Jesus, fully God, fully man.
Do you know Hegel's idea of aufgehebung? As the seed of the apple contains within it the tree, the blossom, and the fruit with seed in it, so (in our view) through the NT, through Jesus, we see that Creation itself was a saving and loving act which, so to speak, implies the Incarnation.
And Jesus, who says that he has come to fulfill, not abolish, the law, is like the blossom which contains in itself the history of the apple tree.
ANYWAY, this line of thought really runs skew-wise to what you seem to be suggesting, so from my POV you start out with a problematic understanding of various Scriptures and end up with a problematic conjecture.
Not complaining or attacking, just reporting on the view from here.
WELL PUT.
And not much for me to quibble with.
Have a blessed 4th.
Heading back out into the sun to try and get some plastic sheeting up in case of some real materialization of predicted thunder storms . . . over the room addition area. Sure don’t want the wood wet.