My intent was to adjust the tiering whenever the Titan got uploaded and new scaling was established, but yes, it will be getting 4-A via summoning.
I think...
Chapter 1 and 2 characters can stay where they are, probably?
Chapter 3 characters are probably gonna be 8-C, assuming that Lanina calc gets accepted. The Knight is fought at the end of the Chapter, and the Delta Warriors can harm it... I'll get back to that later.
Chapter 4, the Titan is 4-A due to quite literally BEING a Dark Fountain, which were established as being 4-A via creation.
I'm actually not sure if being something is a 1 to 1 conversion to scaling to that tier. I believe we've made living stars and planets be tiers below what their form is?
Assuming 4-A Titan is real, the Delta Warriors should scale, imo. They manage to damage it to a point where it has to put up it's defenses and heal up.
So, let's take Ralsei for example. I think his tier should be something like;
9-A | 9-A | 8-C, at most 4-A | 8-C, at most 4-A
Key: Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4
Then scale the enemies accordingly
I'd really like to avoid scaling Chapter 1 and 2 to 4-A because... Local Solar System Level Entites Cannot Break Out of Iron Cage isn't a very good look lol
And this should go without saying, but I'm begging not to humor 4-A Light World physicals lol