Considering the Distortion Detective crew is working for LC and they were basically bound to servitude under Dias last we saw them, plus the LCA guys we saw before all already looked like Udjat, I think it’s pretty certain now that Limbus is part of Dias's masterplan to gain a foothold on/overthrow the Head.
I don't get why people keep bringing this up. If things go the way I think they will, after the House of Spiders invade the LCE labs, there'll probably be a counterattack by LCB on the House with LCA forces.
These two events would be pretty much one after the other, especially if the House takes something from Limbus Company. Putting part 1 in an Intervallo not only would mean a pretty massive cliffhanger, it wouldn't allow for much characterization of the villains. After all, when was the last time a main villain appeared in an Intervallo for more than a cameo or foreshadowing scene?
Intervallos have all been pretty self-contained stories with some hints to the next Canto/larger narrative.