I've posted in the past, just recently, even, that my son has always had his own particular way of doing things and so often lags and then catches up ridiculously quickly or even goes beyond.
It hit me today that even his losing of teeth has been its own pattern. He lost one molar long before the adult tooth showed up. (This, unfortunately, resulted in orthodontic preventative work.) My 7yo niece was showing me one of her loose teeth today. Um, well, that's one that might nearly 12yo just lost recently. But one of many teeth he lost recently. I think he lost 6-8 teeth in the span of a few months. He has no baby teeth left on top and maybe only 2 left on the bottom.
Crazy kid. ;)