The Possesion "tells" like blue eyes and floating orbs around the possessed are probably meant to be taken as "for the players eyes only". We need to know when he's possessed and when he isn't or the loss of control would be harder to pinpoint. I don't recall the Valet ever swiping at the orbs around Lulu, but if he did, it probably just goes into the same category as the "aura" remark. OI made a joke.
Do we actually see the three Gluks blow up? I can't remember. But they don't need to have not been possessed for that, as the factory blows up anyway. They weren't going to be making it out of there no matter what happened.
As for the nature of Sligs, we learned from the scrapped Albino Slig idea that sligs are normally peaceful, and that the sligs we see throughout the game all come Skillya, an exceptionally bad mother. The sligs need love and acceptance, and she sells them to the cartel, who treat them horribly, but fulfill that need for societal acceptance nevertheless. As we saw in the games, the Sligs (who are stupid) are absurdly loyal to the gluks, whom they probably see as father figures, or even perhaps saviors. They'll gun down their own brethren and beloved slogs on the say-so of a Glukkon. So its unlikely they would turn on them.
Another answer tied into that is the idea that they love guns, which they're too stupid to make and rely on the Glukkons for. It is kind of a stretch to see them being smart enough not to hurt the glukkons but too dumb to figure out how to make the guns and pants. But not that much.
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