Where I train, we have a few different people who teach the beginners BJJ class (our head instructor, myself, and another purple belt). We don't really coordinate the lessons we teach, but we've all been together so long that we just intrinsically know what we consider to be the core basics that need to be covered in the beginners class. Sometimes we talk about what we've been teaching, and other times we just build our lessons based on what we see when the students roll, and what we think they need to work on the most. But it really has nothing to do with our game. The three of us have totally different styles, but we teach the same basics.
As for the advanced class, our head instructor teaches them all, as he's a seasoned black belt and the advanced class is all blues and purples. He follows his own curriculum, typically spending a few weeks on a series or a position or a group of moves. And again, it's not based on his own style. For example recently he did a few weeks on DLR and Berimbolo attacks, which is definitely not his style.