Toras Menachem – Simchas Torah 5715 (02) – Sicha Two (02)
Class Two. Page 71-3. Somehow by staying behind the one more day of Shmini Atzeres cures the ill of the unity being broken when we depart from Yom Tov. It is a Yom Tov with no special Mitzvos, so all there is, is unity which lasts throughout the year.