I went back and read this thread again and I have to back up here..
If you have an abundance of cover I think the BG are going to become a huge chunk of your biomass in 3-5 years.. I'm not sure the BG are something you want in many numbers-with lots of cover present.
SMB are not going to control BG unless there is very little cover present, just keep that in mind. WAE will hammer BG when they can but not sure they are near as effective as LMB, which presents a potential issue to me. I'd say wait and obtain some male only BG but they will cross with RES and you will have some (small numbers) cross back to mostly BG. The potential is there.