Well, but having gotten this far in his reasoning, it doesn't make a lot of sense to be trying to play much of an adversarial game against the Others. They are probably descended from, or cousin to, his own dath ilan. For them to have been selected to be a pack of supervillains and himself the only innocent among them, is getting into the realm of generalized novels. If they are a very sophisticated Conspiracy then he already gave himself away the moment that he froze up when hugged.
It does not totally make sense, on the face of things, to try to be Very Clever and Paranoid about this. His hypothetical opponent would be extremely amorphous and hard to fight; and there is a more coalesced and concrete possible friend standing nearby to it, at whose expense that fighting would come.
Take the Others at face value, then. A descendant dath ilan or a cousin to it; smarter than him, in the first case, and of unknown relative intelligence otherwise. They have selected harder on people being affectionate to one another, which is a very defensible sort of choice for a Civilization to make; they give and receive hugs more readily, and bind much more strongly into their polycules.
On the face of things, really, they are the ones who should be worrying about adversarialism from him, once their divergence or his past-relegation becomes known. But they shouldn't be too worried unless there are unfortunate selection effects in play, and this is known to them. His version of dath ilan probably has more supercriminals and non-law-abiding psychopaths than their Civilization, but those are still very rare.