So I finally got a hive through the winter, not for lack of trying ( third year beekeeping). Having finally gotten to the spring I'm suddenly unprepared for the upcoming flow. I have all medium 8 frame boxes and my current hive is just three boxes tall. The top 2 boxes have brood and stores of pollen and honey, but the bottom box is pretty empty. Is this what happens before they "backfill" ? If so I thought i read swapping boxes would fix this, if that's the case should I swap the bottom two boxes and then add supers before the flow, or should I put the mostly empty bottom box on top, and then super? I worry if I do the latter then they'll just fill the old brood comb with honey.