That Scubapro is a spearfisherman favorite. It has no extras, and when empty isn't much to wear at all.
Anyhow, observe divers using all types of BC's and you will see they all work the same. At depth, early in the dive, there well be a little wad of air in the bladder, probably around the diver's shoulders. It will appear about the size of a (American) junior football. As the diver consumes air, the tank becomes more buoyant, and the BC air is gradually released.
My profile picture shows that little ball of air in the BC. (That's at 110 feet on the Rodeo 25). My regular dive group uses all types of BC's and that air is still in the same place. Although it is easy to imagine a diver below with a fully inflated BC, "it don't work that way".
Correctly used, they all work about the same.