Maybe they'll continue to reunite with other siblings ,it may be possible for marco to join at some point depending on how long it takes. Maybe earth itself will try to connect with the siblings too
just like adastra i think there will be like a twist what if marco ventures off on his own and then falls into danger or finds a risky way to contact amicus from wherever he is. though i do wonder how scipio will be incorporated into the story. i would like in khemia a scene where neferu confronts his father or we get to meet his siblings ,in short many things may happen we just have to wait. hahahah