Bill,
I don't know about bluegill dominating in a pond with SMB as a sole predator, but after putting smallies in a .62 pond with largemouth, I know the smallies were really goig after the small bluegill. I know this because the small bluegill would hang around an inflow pipe from my trout pond and the smallies were really smacking them. Growth was raid too. Fingerlings put in, in the fall were up to 14 inches the follwing summer and stocky. In fact, it seemed they were more interested in the bluegills than the LMB's, however many of my LMB's are fed pellets on a daily basis.