We’ve seen three (Judge, Queen and Caesar)
All four of them are important and achieved significant scientific breakthrough. We will get Queen’s real name revealed in Vegapunk’s flashback probably. MADS flashback will occur if you ask me.
Agree on Jack.
Yeah, that’s what I meant. Two others not including Queen.
We probably will see a MADS flashback and Queen in it, but he’s the least relevant of the four scientists. Vegapunk’s the main one, Judge is Sanji’s father, Caeser was the main villain for an arc and in three others beside, whereas Queen’s role is confined to Wano where he’s only the third strongest Beast Pirate.
So if that MADS flashback comes, Queen will be in it… but he’ll be scrapping for screen time with Caeser probably, while Vegapunk and then to a lesser extent Judge are the main characters in it.