I must disagree with your concept of Argil. Although he is a demon, he doesn't seem very demonic. The fact that the Griffin Heart had no effect on him, which should create a portal for demons to Shio, is already an indication. In my opinion, Argil was initially conceived by the writers not as a true demon, but rather as a demonic personality (unless we consider the possibility of his mission as an opportunity for the player to play on the side of Hell). That is, Argil is not a true follower of Chaos, but only pretends to be. Then we return to the question - who was he originally? And regarding the logic of Chaos creatures, I think you are overthinking it. Kha-Belekh, who seems to be the very embodiment of Chaos, acts strictly logically. And all the armies of Hell are subject to strict discipline and subordination; otherwise, they would attack the enemy wherever and whenever they could, rather than in battle (although, of course, one must adhere to the framework of a turn-based strategy). And in general, I think Hell is not Chaos. So many writers have written about the struggle between Chaos and Order that it is wrong to equate Hell (Inferno) and Chaos.
But let's get back to Argil.
@The developers have presented you with an exotic picture of the inner world of a demon, his inner struggle, feelings, passions, life priorities, etc. Against this background, he does something today, and tomorrow he won't be able to explain to you why he did it (because at this critical moment, his (Argil's) principles change almost every hour, and you ask - why did he do this first, and then that...
But do we always know exactly what we want when we undertake something (intuitively)?@
After meeting with Tieru's illusion, Argil, despite all his spiritual quests, acts strictly logically. So, accusing him of a lack of logic seems to me an insult to Argil. He is purposeful, persistent, and resourceful. This doesn't quite fit with your image of a demon who is confused and acts under the influence of momentary impulses.
P.S. And this is no longer about the game. Hello to my neighbor. I only noticed the address today. I am also from Bishkek.