Interesting discussion!
Yes, difficult to imagine that a queen pumping out eggs at the rate of more
than one per minute, 24 hrs per day, could customize the egg size during
its last few seconds of its passage down the oviduct.

But an even bigger question is in regard to supersedure cells.  What
percentage are created from worker larvae, floated to the top of the cell
to make an "emergency" cell, vs. those created from an egg laid by the
queen in a natural queen cell cup?

I've been dissecting what appear to be supersedure cells, and find both.  I
plan to be more diligent later this summer when my colonies with 2nd-yr
queens begin supersedures in earnest in August.  I ask all you beekeepers
to do the same--when you see a supersedure cell that you don't need to
emerge, please first confirm that there is still a queen present in the
hive (confirming that it is supersedure rather than emergency), then take
your hive tool tip and dissect the cell down to the bottom of the jelly.
Please let me know iff the jelly goes to a queen cup (queen produced from
an egg laid in a queen cup), or all the way down to the foundation (queen
produced from a worker cell).

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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