Kogen was like a playground bully, calling people names and being a dick, Sanus was that weasely little shit that follows the bully around like a lost sheep, leaning around from behind the bully, rattle his fist and go 'yeaahh!' If Kogen was Jabba the Hutt, Sanus would be that little cackling pet thing.
When Kogen wasn't around, Sanus was alright, pretty chill guy. Which makes it a shame really.