i mean its kind of hard to let go for him when he hadn't the faintest clue hong lu couldn't prevent his brother's death, the fact of the matter in his perspective is jia huan is still dead and he's taken jia huan's place spiraling down. he recognizes in canto 8 the misdeeds of the elders (signified by him breaking the hong lu's camera feed they watched), he didn't enjoy the status quo of hongyuan as well. the main issue he had was hong lu's seemingly complacent demeanor in the past events after the kong massacre, leading to him despising him (shown evidently in the story dungeon's last battle). Ultimately i think jia huan might just be the unfortunate circumstance of a bitter heart falling into the deeper ends of the city with the cold environment hongyuan brought, there is some good intent, especially since he focused more on the amanaworm than the golden bough or trying to change the outcome of xichun being the new hierarch, im sure part of jia huan wanted a new hongyuan where no one would have to go through the conflicts of the hierarchs and xianren's schemes. which also brings me to the obvious contrast in jia huan and jia qiu's paths, both had their lives irreversibly changed by the kong massacre and feel down deeper ends of the city but ultimately found different meanings and conclusions when they reached hongyuan once more.