Interesting reference of Allens to the work of Winston & Punnet (91% of
queen cells were from eggs) 9% must therefore have been from grubs and a
"grub" queen would therefore have been first to hatch.
The general rule in an emergency is "1st. queen out wins" since they
very quickly set about the "unemerged" - this is not necessarily the
case in general queen breeding but usually is in a true emergency.

Another thing which I've noticed about emergency queens - they often
seem quite small when they emerge but seem to fill out proportionately
more than say supercedure queens over the next few months.

Alan Riach - Edinburgh