Early for drones?

I was in the neighborhood of the Haddock hives and decided to drop by and check them out.
The one has died. I didn't have time to open it up at all to see if I could tell what happened.
The other (swarm caught?) is doing well. Lots of activity at the entrance. I even saw a few drones.
Interestingly, they are using the top entrance (which is very small) and ignoring the bottom entrance.

We talked of splitting this hive if we can find the time.