Dottie and Make A Wish:
DI posted this link on their FB page:
http://print.ditd.org/Overview_Brochure/Davidson_Institute_Overview_Brochure.pdfIf you look on the page for DYS the say the minimum requirement is qualifying IQ score and/OR qualifying achievement score and now they are only asking for one letter of recommendation!
I don't know Make a Wish, you may consider submitting with some supporting evidence, like a portfolio.  I'd follow your gut on this one.  Did the whole reading portion put him at 99.9th %?
I agree with Dottie on this one, though, also.  I think a better picture comes into focus as they get older and establish a pattern of performance.  

Neato