I didn’t understand your question. BBH is just one kind of hopping, the other being SFH. If you read my post well, I said that all channels which hop on the same set of frequencies belong to the same channel group, regardless of the hopping method.
I think it’s also possible to hop on the BCCH TRX even when you’re doing synthesized hopping. It’s more complicated, but ericsson has a mechanism for implementing it.