One other thing, I was back in the bird store yesterday visiting my son's new linnie, and I took a look at the baby senegals. They are all orange vested, but the very young babies DO have much smaller chest patches than Roni does. I did not see Roni or her clutchmate when they were unweaned. The store has one who is now about the age Roni was when I first saw her, and he is very bright orange and has about the same amount she does, maybe a bit less. The babies who are just feathering out have smaller patches, though. I just hadn't noticed until you asked the question.
There are several sub-species of senegal, though.
Did you see Kiwi's parents? How much yellow or orange did they have?