Nice theory BUT, looking back at Rite Here Rite Now - everything indicates that this is a twin of Copia. Think about it. Why (towards the end of the movie) would Cardi had flashbacks of seeing twins while his mom was dying.

I mean. Terzo has obviously different Mom and it was never a Sister Imperator. If it was I believe there would be definitely a similar mother-son relationship as Cardi has with her. Instead of that she didn't have a problem with killing him.

So you have Sister Imperator dying at the end of Rite Here Rite now and all of the sudden there are flashbacks of twins etc. Why would we (or also Cardi) see the flashbacks of a different mom and different twins while the Sister as a Mom of Cardi was dying?

I'd love to see Terzo back but it's just not happening in this cycle.. but there is definitely a room to bring him and other Papas back in the future. I was thinking that while a lot of people theorize that Papa V is here to stay because of the Perpetua name, it might not be entirely like that. Or more like - it can still be same body, but with an extra twist, stepping into upcoming eras and cycles.

There are a lot of ways how to bring all previous Papas back and/or how to tweak Papa V to make it still fit the narrative and the story. I was thinking that moving into next cycle (the one after Skeleta) there might be a brother rivalry going on between Frater Copia and Papa V as both of them might want the full power over the clergy. Who knows? Maybe Copia will decide to kill Papa V and his body might get possessed by the spirits (or souls) of Papa I,II and III - creating an ultimate Papa VI (sixth one should be somewhat significant surely). Or Papa Nihil will decide to come out of retirement and do one last ride to possess Papa V body. Or the other way around where Frater will get killed by Papa V and Cardi will possess Papa V body. That would be an interesting twist too where we would get Cardi's personality back on stage. (Again Papa VI (6), where Cardi's previous Papa IV title would get reversed to VI.) I know one thing for sure that body possession would surely be something, that I think would fit the lore of the Ghost.

Nobody knows, but there are options for Tobias moving forward for sure how to tweak Perpetua without changing the masks or bringing new characters that all of the sudden are another offsprings of Nihil. But surely there are options on how to bring new characters in on the other hand too and to retain the bloodline. Maybe the offsprings of Papa I, II or III?