I know this comic was very much about Marc and Nath and I very much don't want to take that away from them, but I definitely see the parallels between Rain-Piercer & Sun-heart and Ladybug & Chat Noir.
Maybe it's obvious, but I enjoy analyzing it!
Sun-Heart clearly parallels Adrien/Chat. Blonde/golden hair, the whole 'Sunshine' aspect? AdriChat's bright and sunny disposition?
Then we have Rain-Piercer. Dark hair, more concerned about the consequences of them revealing? And the reference to all of the rain symbolism between Adrienette/LadyNoir?
So this could be taken one of 2 ways:
1) This might be referring to the final battle with Monarch. It's showing us that this could have happened between then and now, That LB and CN discussed revealing after Monarch was defeated. Though since we know they didn't reveal, I'd say it's more likely it's a potential hint to the future--
2) Lila/New Butterfly is the "Deep Darkness" (Though it could also refer to the council stuff) And this is foreshadowing what could happen once they defeat her.
Now they realize that if they reveal, they would have to give everything up. Stop being LB and CN? Maybe even never see each other again if their only connection remains their time as heroes.
Chat is ready to reveal but Ladybug warns him the consequences of revealing their identities.
If Chat Noir reveals himself to Ladybug, then he won't be allowed to be Chat Noir any more.
I'm guessing the Great-Rain is referencing the Celestial Guardian, or maybe the order of the Guardians or something. Maybe even Ladybug herself, as she's the current Guardian. Considering her parallel's name here is Rain-Piercer and the authority in this story is 'the Great Rain' it could very well be that they mean 'Ladybug' and 'Ladybug as Guardian'.
And the sacred armor is obviously the Miraculous.
But Chat is ready to reveal. He's waited so long. He wants this. Like it says, He'd rather lose his powers than his partner, who's always been by his side.
Now we have Ladybug, convinced by Chat that she wants this too. She decides to go through with it. Renounce her burden (With a passion!)
Interestingly enough, this time it says 'powers of the Great-Sun...' which... they just said it was the Great-Rain, so I'm wondering if this is a mistake, or intentional? I'd have to really listen to the french to pick out exactly what's said. Maybe 'Great-Sun' is intentional and means something. I'll come back to this if I figure it out!
And then of course, we get the happy ending and the much-awaited reveal and kiss! So Chat Noir and Ladybug reveal, and they have their beautiful moment!
This is the re-written version.
In their original draft, they both gave up their powers to be together. Nathaniel thought it was unfair that they should lose everything and not have their happy ending.
This is something fans have been discussing for ages. And there's the whole possibility of Ladybug losing her memories if she renounces her Guardianship, which has also been hinted at in this season already.
So Nathaniel changed the ending to ensure they got to keep their powers and have their happy ending.
So is Nathaniel a parallel to the writers themselves? Changing the lore to ensure that Ladybug and Chat Noir can continue their journey even after an identity reveal?
So then this leaves the question of which version we're going to get by the end? Is this their way of showing us that they can continue the show for 12 seasons AND still give us the big reveal?
I mean, how do you continue a show like this for so many seasons and keep the fandom on the line for that long with no reveal? This could be their way of introducing the idea that the story CAN continue post-reveal!
That's just my thoughts on the matter anyway! I hope you enjoyed my breakdown!