So okay, the theoretical "cluster" that Apeiron would appear to be part of is made up Apeiron: tinker extraordinaire(With a Fashion requirement?), Garment who has
Textakinesis, and now Lethe: The Mother of All Strangers.
The one thing they all seem to have in common, aside from the well-designed "requirement" is attention management. Apeiron is a cynosure, now more than even. You just can't look away from him, and if you stop paying attention to him something is bound to change. Garment of course is able to
manage attention and ideas through clothing(with a minor tinker specialization in making new clothes, as far as the PRT knows), and Lethe is able to make it so you can't pay attention to and can't remember them.
So the question becomes, what event involving multiple people was A) Stressful enough to cause multiple triggers(it'd just be the capstone of the Tinker, but the shaker and stranger effects indicate it'd involve serious physical harm over an area that was deliberately caused by a person or persons whom the others wanted to get away from) and B) involved these three elements in the last three months(the stated lifespan of independants according to the PRT)?
That's the question the ThinkTank and other PRT assets are going to be chasing their tail over.