There is never going to be any smoking gun. What I see is two people who had everything to lose by this story, and that Hill was in a position to lose more than Thomas. All Thomas had to do was deny what Hill said. Brock independently confirmed that it was Thomas who lied, because Brock could afford to lie the first time. I don't believe he lied about it the second time just to sell books.
BTW, I am a conservative. Just not one who is so obviously, what's that phrase, "Blinded..."
There is never going to be any smoking gun. = I have no evidence whatsoever to back up my baseless claims.
Without evidence, even circumstantial, these accusations are just white noise.