First a technical question. I tried 3 times to post this thread and each time it appeared to get stuck in que. I was just repeating that this morning and discovered it had posted a few hours before. Is it a known issue? Is it my computer?
I agree G.Mark was written post70. In fact I'm persuaded the original form of G.Mark was written as a play for public performance and subsequently adapted as a narrative with a bunch of additions. However the thread was focusing on the language of the charge, to destroy the temple and rebuild it. It doesn't seem that that would have been necessarily controversial for someone claiming to be the Messiah. I find it too coincidental. Maybe the story reflects some historical kernel regarding a claimant to the title that was an embarrassment to the next generation, requiring the writer of Mark to assert it was a false claim and later G.John, to not deny, but reinterpret as symbolism. The 3 day motif plausibly appeared in an early revision of Mark that the writer of Matt had. The last part about, 'not made with hands' a still later addition post G.John. These were hand written copies and easily susceptible to harmonizations and interpolation.
Regarding Zechariah, yes at least 2 authors are now recognized by critical scholarship, but what is relevant is how this work was perceived by the first century Jews. They saw 'prophecy' or dual meanings in texts that on their face did not present as prophecy or suggest a dual application. The NT writers were hardly original in doing this. It's basically recycling. You have only so many holy texts so you make them fit new situations.