Interesting question. For years in the ocean we never used both, it was either gulp or bait on the buck tail or dropper. Bait was usually fluke ribbon from previous trips or salmon belly. Seems like guys fishing the hook area use both and do very well, not sure if it's a bay thing or what. Maybe in the ocean fluke want bigger profile baits. Possibly in the bay the gulp acts as an attractant but a spearing, killie or smaller strip draws the strike. Or maybe the combo would work equally as well in the ocean and we just over looked it.