I don't believe there were any "corroborating witnesses" at all -- at least for the most serious allegations. A person who supports another person's story but didn't actually see anything isn't even a witness at all -- let alone a "corroborating" one.
The only thing Roy Moore is guilty of is being an incompetent political candidate.
He may be a wonderful this & a wonderful that but if he can’t sell his “wonderfulness” in a manner that inspires people to COME OUT AND VOTE FOR HIM OVER AN ABORTION LOVING GUNGRABBER - Jones. That screams political incompetence!