As it turned out, not only did the old brood emerge -- new brood moved in! So to speak. This is my weird hive that had 3 queens that I separated into each box for a short while a few weeks ago. There's brood in each box now. So with brood in the super, they aren't gonna leave there. Or leave the brood in either of the deeps, either. I've given up on trying to force them to do what I want them to. So I put the super on the bottom and began feeding again. There are lots of bees in there, and more to come, apparently. Maybe by spring they'll all be near the top of one of the deeps and I can pull the super then. Sigh.