Canon is so frustratingly vague on this matter... is it just another baseless rumor, or is it the truth? I buy my sourcebooks for truth, I can speculate well enough on my own. But enough of my frustration with Speculationbooks over Sourcebooks.
My take, is that PART of the Wolverine survivors wound up as this dark force within comstar. and another part of them is out there, somewhere else, gone for good. Possibly, if you believe the old stock answer, holding back the aliens that shouldnt be in battletech.