I've already written a little about what a theoretical Lodestar arc could be like over here:
https://worstgen.alwaysdata.net/for...rc-be-the-final-war.74101/page-2#post-6397013
(Uh...it's the last "chunk". Keep scrollin'. It starts with "So, final bet time". I do tend to go on.)
But, outside of that little fanfic where Blackbeard and Shanks' fight causes a new Demon King to form, there are a few other things we could see with a Lodestar arc.
There's some theories that Lodestar may contain the ruins of the Ancient Kingdom. So, for that reason alone, it may be more interesting to visit than you might think.
Lodestar might be a chance for Oda to give us at least part of the Void Century flashback. The Void Century flashback is likely to be another pretty long one. I am imagining it could rival the God Valley flashback in terms of length. So, Oda may either split in into different parts, so he can kind of feed us details over the course of Lodestar, Laugh Tale, and whatever may come afterward. So that we don't do it all at once. Or Oda could give us a "outline" of Robin's interpretation of the True History, before we fill in some of the gaps that we could learn on Laugh Tale. A simplified "fairy tale" version of the Void Century history that Robin's learned from all the Poneglyphs, before we learn the truth on Laugh Tale.
Lodestar may also be necessary. It may not be as "optional" as we think. Personally, I'm kind of imagining that you have to do something on Lodestar in order to literally point your way to Laugh Tale. You may have to activate some machine, or find special instructions on a wall, somewhere to learn how to get to Laugh Tale. Kind of like in a video game, where you have to put all the magic gems in a pedestal in order to activate a magic beam of light that literally points your way to the next quest? Something like that, in my mind.
It's also possible that Lodestar could be the island where Ace and Whitebeard's graves are. Lodestar and Sphinx could be a Elbaph and Warland situation, one is a smaller part of a larger island. That's not confirmed, it's just a theory. But, if it was, it would give Luffy a chance to say goodbye to Ace one last time, before heading out into the True Final Arc. It could be a nice little emotional moment.
So, I feel there is stuff we could do on Lodestar. Especially if The Man Marked By Flames is there, alongside the last Road Poneglyph. Even if a lot of it IS a lot of "summary" of what we already know. A "summary" island would give Oda a chance to get the readers back up to speed on what's going on. Not everyone who reads One Piece is as into it as we are. There's probably a lot of people who weren't even BORN yet, when some of these plot threads were introduced. So giving a chance for more readers to catch up by summarizing what we know wouldn't be the worst thing ever. We kind of already got that on Egghead, but we could do it again...as long as Oda keeps it pretty short.
But, we'll see. It's not confirmed to be Lodestar next. But, I do think Lodestar is the most likely option. It does seem to be what Oda is hinting about.
