One also has to wonder to what degree a host's nature and personality influences an Ascian, especially if they are a living host for a significant period of time. It might explain Lahabrea's recklessness and arrogance as well as Solus' fondness for the arts. Or it could simply be that the personalities they display are wholly their own. In which case, that suggests a significant degree of free will - and one has to wonder if we could, at some point, reason with an Ascian. If so, my guess is that Elidibus would play such a role. Given the Ardyn vibes I'm getting from Solus, I wouldn't be terribly surprised if his actions end up going against Elidibus' plan. Especially since he shows a measure of contempt towards both Elidibus and Lahabrea...whilst also claiming to have been 'rudely awakened' from a state of slumber.