I haven't looked at any that he might have changed to neutral since I excluded him from my trust list, but he definitely has a habit of abusing the trust system with wrongly-given negatives.
It's not an easy job to find time and check someone's feedback leaving history, especially when the user lefts over few 100s of them. A few days ago I was looking at the feedback he left for others. It took a great deal of time though but I can assure all that almost all of them do not look good in fact like you said they are abusive nonetheless they are negative or neutral. I sense an ego conflict in him, which is not good at all. When he leaves a negative, he wants it to stay, and he makes sure that by any means he makes the other guy guilty.
I think JG's heart is in the right place...
He is very quick and aggressive, served by ego.