<some children developmentally can't even make a few sounds correctly by that time. There are late developing sounds for some children that are considered developmentally appropriate to not have yet by kindergarten....such things as L, R, S (sea/C sound that S makes)...along with several blends.So to expect all K children to know all their letters and sounds before entering K seems a wee bit ridiculous!!>

Just wanted to point out:

just because a child can't sound out a letter doesn't mean he or she can't 'know' it, i.e. understand its meaning -- my son recognized all the letters, and was able to recognize the sounds they made, for several years before he was able to *make* all their sounds correctly.

I don't believe this asynchronicity is unusual among gifted kids. It did make him difficult to understand as a toddler, but didn't interfere at all with his ability to read.