Interesting theory, Con. Though I think you're reading too much into that WoJ, the idea that Mab helped destroy the BCV might be supported by the Paranet Papers. It's never explicitly said, though. Mab's motives for supporting the revolution remain a mystery.
Her reason could be simple enough: getting rid of competition. The Fae prey on humanity too, but they need them for more than just food.
I'm looking forward to how she's going to deal with the Whites.