That’s a great idea. I like using Groove Agent 3 to get an idea quickly going, but then get a MIDI track from it and switch to BFD, as the samples and processing options are much better. So assuming that GA3 is not going to have the BFD level of depth (going on GA3 facilities), being able to use the pattern engine of GA3 to trigger a drum module would be awesome 
I’ve said it before, but don’t forget to have more toms in the kit (6) and don’t forget the rototoms!