I'm throwing this in not out of nowhere.
Remember King's merienda shit? It's nothing about it being wrong, dgaf about that.
It's just, King looked exactly like someone who could fight Sanji for fighting style, everything, flying, kicking, fire based attacks.
Didn't happen.
Oda might be unpredictable with opponent for Sanji if he decides Sanji must fight an Admiral.
I think Kizaru or Ryokugyu are too obvious.