Based upon that & how none of them in the pictures seem to be bearding on the entrances, I would just assume that it’s a virgin that hatched (might be hard to spot by going through the cluster) & gathered a court, & collect/house them in another nuc. But that’s just me Worse case scenario they come back & collect in the same spot? Best case scenario, you get two additional colonies? They could also be a swarm from the mother hive?He had a hive with swarm cells that he divided and placed with the splits.
Exactly my first thought.How were the splits made? i.e., More than one cell per colony? Did you load them with nurse bees? My ideal would be first queen out gathered a court & swarmed? But it is just an idea based upon limited information.. Have you looked through the ball to see if there is a queen or virgin queen?