*Removed the images for the sake of the size*
I understand the connection you've found and I'll agree that it fits if you want to interpret those moments like that, but I still don't see it the same way as you. The way I view it is, again, the way I firmly believe is most likely what actually happened.
The scans of the first fight: I believe were done as nothing more of an artistic choice to show that, despite their clash, there is still a bond between the two (and not because they both happen to be reincarnations of space gods).
The scans of their second clash: I believe at that point Kishi had decided to continue to use that initial artistic choice for every significant encounter between the two, but going one step further by having Naruto and Sasuke verbally interact with each other. Plus other characters have been shown to have similar "subconscious interactions" such as Obito-Kakashi, and (if I remember correctly) Naruto-Obito.
The scans of their final clash: Again, I think that by that point Kishi had decided that a moment like this was necessary for any significant fight between Naruto/Sasuke.
As for your question about my comment on the retcon(s), even with the scans you provided I still view the whole thing as a giant --though admittedly, clever-- retcon. What Kakashi said at the time (though I don't recall those being the officially translated scans) I believe you can take at face-value; whatever the official dialogue was, he was clearly referencing Madara and Hashirama -- a parallel that would later be constantly hammered down in the manga throughout Part 2. Over the course of the manga, Kishi has constantly made characters to serve as parallels to Naruto and Sasuke and each new parallel it seemed like he would create for plot convenience (in other words, a retcon). First we had the parallel with Jiraya and Orochimaru which served to reinforce Naruto's resolve to save Sasuke from himself, then we had Madara and Hashirama which served a wide variety of things, and then at the tail-end of the story we had Indra/Ashura which served ??? (like seriously, there really was NO benefit to that plot development lmao)
If you want to view those scans as proof that Kishi has set this up from the beginning, you go for it. I won't try and hide that I've grown quite cynical over the years and have developed a habit for taking into consideration what happens behind the curtains and how they impact what's being presented. And in this case, Kishi has demonstrated a habit of making changes to previous events/explanations/details over the course of the manga more or less as he went along (and to be clear, I'm not faulting him or the manga for this - no one can plan out EVERYTHING in a 700ch manga).
The parallels were not for plot convenience, it was for development of Naruto's character. Naruto is a empathetic character who develops off the interactions he has with others. He feels their pain as a result. He tries to learn from this and looks at the past to better the future whereas Sasuke looks to destroy the past to better the future.
As you said, nothing is going to be perfect in a weekly series spanned out over a decade with changing deadlines and editors. With what he set up in part 1 and part 2, he's shown great enough story telling for it to be not seen as a recton.
With what I said above, I do not see what of the established facts that were adjusted, ignored, or contradicted by a subsequently published work which breaks continuity.
He introduced new characters that were not referenced in part one or late into the series but that does not make it a recton.
Think about it, Naruto said, "you just cant beat Sasuke like that", "We're going to die", Obito saying "I will make you fight".
Zetsu ominously observing the fight and yet not attempting to capture Naruto right then and there. Kakashi's reference to a cycle.
Kishimoto had scattered ideas throughout the series that he could have left but with his story telling and despite restraints stitched them together with little to no continuity errors in order to give us the story.
Yes, established facts are changed but you have to observe who is telling these facts at the same time. Think about Madara's story via Obito compared to Hashirama's account.
Or Madara's account of the tablet or who defeated Kaguya compared to her own or zetsu's account.
Established facts become changed due to unreliable sources which are twists in the story.
My biggest beef are such things as Kaguya/Madara being restricted due to improper power scaling and things like Madara using susanoo while blind.