I'm not too happy that we're branching away from Gustang vs Traumerei, but at least we're locked in for both of them staying around for a while, so that looks promising.
Considering Gustang is still in their base, I don't see a way for them not to meet eventually. Is Traumerei just going to ignore the fact that a Family Head is actively attacking his turf? They all seem prideful, so I expect things to converge back into a big scale event over the next few chapters.
Rachel's also a good addition, but I do hope that this princess conflict is the last nail on that "Baam simping for Rachel" coffin. If he starts rejecting everyone around him because of his feelings for Rachel, I'll be pissed. It's not that I'm trying to backseat mangaka the shit out of SIU, but it'll feel like the train station character development never happened.
Don't you dare, bro.