My son skipped 3rd and went to 4th last year. To be honest if I really pushed it he could have skipped 5th and been appropriately placed in 6th. He is happy in fifth so I am glad to let him be happy if a bit under challenged in some areas. What to do next year is the big question.

Not knowing your situation, could he skip right now to fifth? Instead of skipping 5th right into 6th?