Khan's guess couldn't have been more baseless. Honestly, he partially doubted it himself.
The True Chaos' God had to have placed a failsafe of some sort, and Khan could already spot many reasonable iterations of that with the little information at his disposal.
If the Kings carried shards of the God's divinity, chances were that they could expand themselves and evolve, becoming Gods themselves in his absence.
The God could probably also use those shards for himself. Khan had already guessed that the Scarlet Eyes' army was a superior version of the Nak, leaving that option open.
Actually, the possibilities were endless. Khan didn't know what that superior realm entailed, so even the most insane and irrational ability had to be within the realm of what was possible.
Nevertheless, Khan's statement did imply a version of killing appropriate for the target. He didn't only consider killing one specific creature or existence.
