I imagine that Masaomi will be pretty upset when he finds out Mikado was the leader of the the Dollars all along and never once extended an invite to him. He's been curious about the Dollars the whole time since he left the Yellow Scarves. I wouldn't be surprised if he found out, and then returned to the Yellow Scarves as a result of feeling betrayed.

But I don't really see the same situation (at least in this episode) with Anri and the Slashers. It seems more like she and Saika will be regaining control from the impostor-Saika and the crazy girl. I'm not sure how she even wrested control over the blade herself, but I just don't see why she would allow them to remain possessed.

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There shouldn't be any question now that Anri's Saika is the original. If she can summon it under her clothes and then pull it out in a similar manner to the way Celty hides her phone, wallet and other things, it is surely a true demon blade. It wasn't what I expected. I had figured the original Saika had been melted down or broken and reforged into multiple smaller blades.

From the flashbacks (which look like they will go into detail next time), it looks like Saika possessed Anri's mother, killed her father and then herself, leaving Anri surrounded by their bodies and Saika stabbed into the floor. How she managed to make an arrangment with it...I can't even speculate.