This is a very long thread which I simply don’t have the time to read, so maybe someone brought this up and maybe they didn’t, but I think you are laboring under a false impression about how the Bible figures into Catholic doctrine.
The writers of the NT didn’t comb Daniel looking for “proofs” for anything. Neither did they comb any other such writings for proofs. When they cited a passage/verse they were using them as a witness to what they already knew to be true. So, you are right that they read Jesus’ story back into the writings you cite, but not with the intention you seem to believe.
The Bible is not a prooftext in Catholic thinking. That’s a Protestant notion. If you want to argue about textual proofs you’re on the wrong forum. I’m sure our Protestant brethren on one of their forums would be happy to go around and around with you about it. That is if you want to waste your time and efforts there.
The NT is a witness to a living, breathing Church that compiled Sacred Writings, both old and new into the Bible Christians look to for guidance. It was compiled to be used in the liturgies and rites of the Catholic Church, not as a proof for Jesus’ Messianic claims.
We Catholics base our beliefs on the testimony of Jesus’ Apostles not just on Jewish writings that preceded the NT. Indeed, the one of the main criteria for a writing to be considered for the NT is that it be apostolic in origin, not merely that it contain anything that might just give credence to Catholic teaching about Jesus.
I hope that helps you in your attempts to get us to see “the truth”. We love truth. We have no problem with the idea that books were written long after the events they depict. We’ve known that for a long time now. It doesn’t matter. What makes a writing inspired by God is the truth it tells not whether or not the persons in it were real or mythological. You are shadow-boxing by using that argument, dear friend.
What I’m trying to say is you are barking up the wrong tree if you believe your information is going to make our faith tumble into a pile of rubble. We don’t believe in Jesus because of some passage in Daniel or any other Sacred Writing. We believe in him because he rose from the dead. It’s really just that simple.