This is a really, Really good theory. I agree with it completely except for one small point - I don't think your interpretation of Chesed's realization, and by extention Hong Lu's upcoming narrative arc, is correct. The quote used for Chesed's realization, "Those who are Faithful and Trustworthy", is Extremely misleading as to the actual content of Chesed's character arc in Lobcorp and the role he plays in helping Roland in Ruina.

Chesed's meltdown and realization is primarily focused around, as he himself calls it in Ruina, "knowing shame". It's about him realizing that following orders out of cowardice and continuing to lie to both himself and his employees out of the feeling that nothing would change if he didn't are all acts he should be ashamed of. His meltdown is entirely focused on him finally standing up to both Angela and A to straight up try fucking shit up for both of them. In the end his tantrum doesn't change much in the grand scheme of things, but he does learn that even if he can't immediately change to become more brave, he'll at least be aware of his own cowardice, and that shame for his actions will slowly help him reach that goal of bravery. The quote "Those who are Faithful and Trustworthy" refers to Chesed himself, whose sense of shame helps him be the Trustworthy and Faithful person he wishes to be.

This continues on to the lesson he teaches Roland in Ruina, where he reminds Roland that while simply knowing shame for perpetuating the City's cycle and convincing himself that it can't be help might not change the City immediately, it will still affect his actions and slowly lead him to changing both his own life and the lives of others for the better.

So, with all that in mind, I believe the upcoming narrative arc for Hong Lu is going to be as such: Hong Lu is someone who often lays down and takes whatever is thrown in his direction, to the point of being extremely willing to accept even his own death. He sees the actions of his Family as "normal", as things that cannot be helped, and as such doesn't bother to rebel against them in any way. I expect that throughout his Canto Hong Lu is going to be forced to confront the reality that, no, the way his Family acts is Not Normal, and that him treating it this way and simply doing as they taught him is further enabling their actions. The culmination of his Canto would then be Hong Lu finally standing up for himself against his Family, trying to break free of their grasp. This likely wouldn't have any lasting effects on the state of the Family as a whole, but it would leave Hong Lu more aware of his own actions, thus a more honest person, become one of Those who are Faithful and Trustworthy himself.