Of course it is always futile to speculate about pseudonyms, but I note that Iskander Kahn seems unusually well informed about cryonics and its associated personalities and organizations, appears to have a grudge against Saul Kent, and has begun posting very shortly after the departure of S. Van Sickle from Alcor.
If Kahn is indeed Van Sickle, it's sad that he lacks the courage to post under his own name.