The narrative is the substitution of the last order (humans) with the new order (cyborgs, clones, etc.). It's about turning the most dangerous pirates of the seas into ultimate weapons that can't oppose the world government. It's about deshumanizing the world and making an utopia for the ones who reign it. It doesn't matter if they use the bloodline of a race they erradicated, or the blood of the ones who are their enemies. Seeing an Ace clone won't be a "revival". It will go that way, you can't play with people's memories like that. As long as these persons are precious to someone or they are acknowledged, they can't exist as a weapon for the ones who murdered them.
"Revival" in One Piece has been a thing sice Thriller Bark. The soul is dead, but the memories of the body can be found if you dig deep. It's an interesting concept since it's used as a way to send off the remainings of a person who ceased to be a long time ago. If you didn't bitch about Ryuma, Cindry or Oars, don't bitch about this.