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Just my 2 cents:

  1. I think SAD is the "medicine" Whitebeard received in chapter 234 when Rockstar was aboard the Moby Dick to deliver Shanks' message. Doflamingo provides it to all Yonko who gain strength from it with the result of exeptional growth.
  2. Monet is the nurse we see in that chapter right next to Whitebeard.