Sabo: Dead or Alive?
Obviously Sabo is dead: his ship burned and sunk, he was shot by Saint Jalmack head on, Dogura saw him die, Ace and Luffy accepted his death. If anyone has any agreement or objections, please don't hesitate.
Since nobody in the series specifically stated that Bellamy or Gin died, that's why we don't classify them dead. But now Sabo is considered dead by Luffy and Ace, and Dogura himself said so specifically, surely we have to take their word and consider him deceased.