I thought the reason Kayn simply describes Gan as a psychopath and the others in such a way is leading to the revelation that he has called the Federation and his devotion to them.
So kind of showing his bigotry before you find he is for the state.
As for Gan, although I see him as a level headed man esp. in Way back and although not a genius, a normal guy, that limiter does make me wonder. Here's an idea, maybe he didn't just kill the guard, maybe he went on a rampage and killed loads of guards. His anger and rage were such they needed some of that drug from Season 4 for him, but as it hadn't been created, they gave him the limiter. To slow the adrenaline.
M.
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