Bees build comb TOP to BOTTOM, they feed BOTTOM to TOP.
As a standard practice in Spring (bottom hive bodies are 'usually' void of bees as they move up to feed) I remove those empty hive bodies upon the first inspection. Depending on the strength and size of the colony AND the amount of remaining stores, I'll either leave it off until bees build up or will place it 'above' the broodnest, if queen is actively laying. This should never be done 'if' there is more winter ahead as it can effectively separate bees from any feed (sugar or honey) that is above.
Your description of mostly 'drone brood' indicates queen failure and/or possible laying worker IMO…..
Especially this early. I would not expect Drones in a hive with no workers unless you lost the queen or the queen is new and never mated due to winter.
Were the Drones in worker cells?