spoilers:end of spoilers
I also feel that this relationship between Shoto and Dabi in terms of writing execution will probably turn out alot better overall than how muddled the Uchiha brothers' relationship ended up being in that story. I'm also really curious to see them fight, because just on the surface it feels like Shoto would probably overall win. Even though we know Dabi's fire is extremely powerful, we know for sure more powerful than Shoto and Endeavors', there's also of course the issue of it burning off his skin the more he uses, so he can't really overuse too much. Plus Shoto has his ice, and as shown with Geten, who was able to fight Dabi to a standstill, that could probably greatly assist in overwhelming him in a one-on-one.
With how many status quos being broken, it does keep making me think about the possibility of One For All actually becoming public by the end. Cause just right now we've got: Endeavor, Aizawa, Ryuku, Manual, Rock Lock, Shoto, Iida, and Nejire, all who have seen Midoryia using his powers fighting Shigaraki and/or know Shigaraki is after him (and Endeavor's straight up heard "One For All"). It's a pretty weird selection of characters to seem like they'll be the only ones to figure out the secret, making me believe either a couple more more relevant characters will also learn, or just everyone will.