Hi Adam
The fanning at the entrance pulls the queens in, sometimes more than one unfortunately. I never intended to have so many in one place but people keep dropping them off.
I have rescued 3 clusters so far like the one in the video above.
Very few queens have actually gone missing. Of more than 50 apideas, I think there are only two or three without a queen.
I am using your record card in all of them and it is a godsend. There is no way I could remember which ones have queens and which haven't a couple of days later.

There are still those who don't accept that queens leave with a bodyguard of bees on a mating flight but I have seen this a dozen times now. The curious thing is that every bee from the apidea accompanies the queen. I wonder if under normal circumstances there is a fixed number of queen escorts, 500+, which is greater than the total number of bees in an apidea leading to its total abandonment as the bees accompany her. I wonder does the same thing happen in full colonies. It certainly happens with nucs as a couple of years ago I had two queens land short in almost exactly the same spot and the bees with them balled each others queen and killed both.