So after reading through this entire thread, alongside reading through the OP and its propositions i have come up with my own conclusions.
1. I'm completely in agreement with the Shippuden and The Last scaling for all characters, personally i'm more in agreement with the Low 5-B+ scaling for Toneri and BSM Naruto but i would be fine with the 5-B scaling as well.
2. I'm entirely neutral on the Kage scaling to 5-B since both sides have justifiable contentions and i'm someone who isn't that knowledgeable on Naruto, so i don't know which side is "more correct" per say, through if i had to choose i would definitely go with the "upgrading the Kage to 5-B" side since the arguments against the scaling are honestly lesser compared to that side's arguments, especially since most are entirely based around personally incredulous feelings and not really counters to what that 5-B Kage side is proposing.
3. I disagree with Shikamaru scaling to 5-B but since that has been dropped i'll comment on that no further.
4. Everything else i didn't mention i'm in agreement towards, including the Shin and Hokage Kakashi upscaling as well.
Can't believe it took a Bleach goon to upgrade Naruto, y'all gotta do better smh.