Thank you Sung. I learned a couple things too.
The bigger/rounder the queen the better, studies showed more viable egg production.
Also, to explain the 5 day capped queen cell event Dr. Tarpsy described a bit differently:
We are talking about Intercaste or Scrub Queen...
All fertilized larva destined to become female are fed Royal Jelly for 2.5 days.
Those to become workers then get fed a different recipe of Jelly that inhibits full reproductive-gland development.
The 2.5 day old larva destined to become a queen continues to get Royal Jelly the rest of her 8 day larva phase and develops full reproducion glands.
Heres where it gets interesting...
Let's say you've identified a hive is queenless and without wet brood. You give that hive a frame of wet larvae which includes eggs.
Precisely 5 days later you check for queen cells.
The queen cells that are already capped have 8 day old larva in them and therefore had to have been made from a 3 day old larva or even older larva which means that larva probably was fed the second stage of Jelly while in the donor hive then back to ROYAL Jelly when it was installed into queenless hive.
Queen bee larva fed ANY amount of regular Jelly will be forever changed physically and become an inferior queen.
The longer a larva gets regular Jelly before being switched back to Royal Jelly the more underdeveloped and deformed she becomes as a queen.
The same can be true when grafting. If we graft a 3 day or older larva and the queen making colony makes a queen from it, it'll become Intercaste.