How does "A Clear is at risk until OT3" fit into the Chakra Energy theory? Why should a Clear be at more risk than a wog?
I think the whole "at risk" concept here is no more than a marketing strategy, whether applied to Clear, OT3 or NOTs. But that is purely opinion. I don't know of any valid-looking research in the area. Hubbard's statements hardly qualify as evidence of research having been done. Maybe he assigned cause for his own sickness at the time NOTs was developed to his own BTs and Clusters, so therefore it must apply to everyone.
Hubbard had it all neatly worked out with a Clear defined in the OT2 materials as a being who had separated out from his composite case, the BTs and clusters. As a theoretical idea it's quite neat, but only in that silly Scn Universe inhabited by BTs and Clusters, where any charge after Clear belongs only to some entity other than self. I can't think of an equivalent involving the layers of the human energy field and underlying parts (hara and core star in Brennan's terminology).