The series has me wondering more and more if the crew of the Ghost is going to become more deeply involved with the Alliance. They're basically passing themselves off as a freighter crew that regularly gets involved in "Imperial entanglements". But from the episode with the droids to their rendezvous with the blockade runner, it looks as though "Fulcrum" may actually be Bail Organa. He was overtly shown in the episode with Threepio and R2. And when the crew of the Ghost handed over Seebo, the ship they docked with looked like the same blockade runner from the episode with the droids.
Part of me feels the Corellian Corvette was something to throw us off... Just a suspicion. Then again I could see the show not really being that clever, too, and just making it Bail.
I think Fulcrum is definitely Bail Organa. It's easy to extrapolate that after C-3PO and R2-D2's encounter with them, he learned a great deal about what they were like and started feeding Hera intelligence. At this point in time, the Rebel Alliance is still gathering. They haven't even gained their first major victory yet.