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They are also present in Tsumihoroboshi, but they were rather "minor" in these arcs.
They are completely absent in Watanagashi/Meakashi. The reason behind is very likely linked why there isn't any disaster in the said chapters.
As for the "allegeance", considering what we know in Himatsubushi-hen, their expertise, and professional skills are hardly equal to the Sonozaki. Thus, considering what we know from Reunion and this episode, we can assume this isn't the "the sonozaki were plotting a bioweapon", considering these guys are likely linked with a bigger organization.
What is much more important to note is that they obliterated the Gosanke leaders in the school as well.
In conclusion, they are rather a third party, absolutely no in either "rika's friends" or "sonozaki leaders".
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