Nah shit sucks even before that. Seriously the whole shit after Jin taeji dies is pointless. Like the blue haired mori and everything linked to him got tossed aside and forgotten after the timeskip. This fight with mubong could have been done right after he killed Jin taijin, Author would just do the same either way, as he is practically ass pulling every power that he wants to give to Mubong. Just to make sure he doesn't die.