So in S05E08, Hondo said he was going to sell off Ahsoka to a high bidder. It wouldn't have been the Jedi, and by the fact that neither Dooku nor Grievois seemed to know anything about it, it almost certainly wasn't the Separatists. Here's my theory: It was Mother Talzin. Here's the thing: Mother Talzin would, I think, love to rebuild the Nightsisters by starting with a female Jedi she could turn to her own particular brand of the dark side. Hondo did say that it didn't matter if Ahsoka was alive or not, and I'm guessing that Mother Talzin has her own magic that would make "not" into a problem that could be overcome. In fact, in some ways it might even work better for her. So, does that make any sense? Or what are your alternate theories?