She told me (and I'm paraphrasing) that she didn't want them to get their black belt too fast, so she was pacing them. I told her they could get their black belt, and then keep going in the black belt class and get 2nd or 3rd degree. They were a lot more regular after that. There were still periods where they took off for a while (for other reasons), but at least they didn't feel the need to artificially hold them back anymore.
So she thought that BB was the end of the road in terms of promotion; being the reason why she did that?