Looking at johhnyUA's feedback I would be a bit more distrustful of him based on the feedback left by KTChampions then the ones by bob123
However, since I don't know KTChampions if I was doing a trade with JohhnyUA I would still have to spend time poking around their posts to see what is going on.
IIRC KTChampions exposed JohhnyUA's sockpuppet and got hit with a retaliatory red trust. Two wrongs don't make it right and all that shit (and I think bob123 should revise that negative rating, and KTChampions' second rating is probably unnecessary) but JohhnyUA is abusing the trust system himself in that case.