As though the Old Testament has no meaning (or cannot be understood properly) without the New Testament when the truth is, the New Testament cannot be properly understood without the Old Testament.
Nope. You aren’t the first to notice something because you’re a brilliant exegete; you’re first to notice something that no one else ever has because you’re insane.
Again, the New Testament needs the Old to be understood; but the Old doesn’t need the New. So just let the Old Testament be the Word of God in its own right, ok? Bloody Marcionites.