Uhh, the lovely ladies of New Paris? Charlotte is no joke. She even knows about Island 4 somehow.
Also, it's possible that Cynthia doesn't even know who is behind the revolution. I can't imagine Cynthia and Callista being too aligned forever. There's a lot to be said about Cynthia. Elena called her evil... Otto implied that he 'serves' Cynthia, but Callista is his true mistress, and he's all about the revolution. Hell, Astrid and Yvette are trying to hide it from Veronica. And the rest of the Karlsson Group is only slowly piecing together that it could be Yvette (someone close to Veronica, but not Veronica herself). Not sure if they're even aware that Astrid is awake. Likely not.
The power rests between Karlsson Group, DeKock Syndicate, and New Paris. Callista has no real power in any of these three groups and she has a glaring weakness which is that she is willing to die for people she considers family. Also, at the start of episode 8 (during the flashback on Cole's birthday or their anniversary or something), she seems to think that she's going to die and that Kane will never forgive her. Doesn't sound too promising.
Also, to Stan, Olivia definitely knows Callista is alive. Her reaction in the latest episode before they have fun with Cassandra tells it all when Kane says "If only Callista was still alive".