Another point on the social/athletic issue, is that we're noting, 4 weeks into our skip, that second grade seems to be the year that the boys split into the sporty group and the not-so-sporty group. The not-so-sporty kids are spending their time doing active stuff, just not playing basketball and football. DS reports spending his recess time kicking a 4-square ball against a wall with a few other kids, and I know of a group of second grade boys last year who played demigods as some sort of Percy Jackson derivative.
I suspect a younger, weaker, less coordinated "sporty" kid might have a harder time than the introverts/creative playground types.
