Miscavige does seem, like Hubbard, to be extremely paranoid and fearful of anyone who might usurp him. That seems to be the case not just with Jentzsch but with Rathbun and Mike Rinder as well. At least Rathburn and Rinder were able to get out; sadly, Jentzsch hasn't been so lucky.
Also worth noting that former spokesperson Tommy Davis (Anne Archer's son) and his wife, Jessica Feshbach (a second-generation church member from a very wealthy family) are no longer in the church, though neither has spoken publicly about their departure. Davis was, at one point, Tom Cruise's personal handler.
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body