Actually, for us, the issue is how many times do we disrupt his social circle in the next two years? If we skip him now, he will leave his school in a year and a half, and have to make new friends 2 times in 2 years. If we keep him where he is, he will only have 1 social disruption in 2 years when he goes to the new school. It's also important to note that when he goes to his new school, all children will be new at the same time since the school starts at 5th grade. I view this as an easier transition, obviously, because all children are in the same boat (save for the 1 or 2 kids who may have known each other at a previous school).

I would love to hear from more people. More feedback, please!