I am exactly paralleling the question - "why haven't victims come forward to make victim statements during his PCRA" -- the answer to that is, that it's not at all necessary. All burden is on Jerry to prove innocence now.
As such, it would seem to me that finding those kids would be the question -- why haven't his defenders shown up at PCRA's?
If you look into this (the only one you've pointed out) John Green, talked to his angry neighbors, ex-girlfriends, enemies from high school, do you think you would believe him?
Note, he was a character witness in the sentencing phase of trial. Jerry was already guilty at that point. The prosecution had no need to debunk his claims of spending lots of time with Jerry, and no need to explore whether or not Jerry had ever put his hands down his pants.
The defense had every reason to ask about that, but they didn't. Do you want to know why? Most likely, because they didn't want Mr. Green to answer that question in court.