Also not what you asked, people move from State 1 to State 2 all the time, without giving any thought to educational gaps. And I will say that EPGY math, which is tied to California standards, does not align at all with our state's curriculum standards. I could see a kid moving between states having significant gaps, even without a grade skip. But you never hear about that, now do you?
Valid point AlexsMom. I was student teaching during Hurricane Katrina. We received a lot of displaced students who not only had significant gaps but were also dealing with the trauma of the horrific situation. Most of the students and their families only stayed in our area for a few months but I have to ponder how their schooling was effected by the tragedy.