I just started reading this series, but I'm of the opinion it's still in mainline canon, not a what if alternate universe, just set into the far future because Akamatsu-san wanted to do something different with his sequel series.
I'm guessing we'll eventually have the holes from the end of the first series filled in as time goes on, now that he doesn't have to worry about a bunch of idiots robbing him of creative control of his own canon, so it'll be a time delayed fully absorbed finale for the first series.
I'm guessing we'll eventually have the holes from the end of the first series filled in as time goes on, now that he doesn't have to worry about a bunch of idiots robbing him of creative control of his own canon, so it'll be a time delayed fully absorbed finale for the first series.