I think it's finally safe to say that this Final Fantasy is an arc of its own.
Seriously, this cult is such a terrifying consequence of the war
While I'd like to say that, given how Sorachi had always had the long game in mind, and therefore the way this extended epilogue is turning out is entirely deliberate ... I have to wonder, what does this make the hype around the Silver Soul arc?
I mean, that arc had been suggested as the "final battle" in-story, and the start of the arc even made a final boss joke with Madao. Depending on how Sorachi treads his step, all that can be excused as either (i) taking advantage of reader expectation, (ii) deceptive marketing or (iii) simply the Gorilla's trolling as usual.
Idk, I really think that the Silver Soul Arc was supposed to be the final arc but then probably half-way through, Sorachi decided to extend the story.
However, this was definitely a massive troll on his part too because we all thought Gintama was ending just for us to have this timeskip into a new epic arc