Based on what Volgoat has said, BBs are the real deal. As for why the drag, I can think of a reason or two.
Number one, no patent yet. Two, if I knew I had a block buster in BBs, I would drag my feet until I had moved Bavi along far enough to either monetize it by getting it on the market, partner it, or sell it.
I would not want the would-be players starting to talk about BBS until I had someone hooked on Bavi.