So, I asked Azathoth what he thought about this upgrade and this is what he told me:
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don't currently follow NNT, but here's what I'm getting from a quick readthrough.
There is a character with a ~380 teraton feat, which is in the High 6-B range. To reach 6-A, a character only needs to be around two times stronger than this character.
The guy who performed this feat is way weaker than Late Morning Escanor, so LM Escanor could already possibly be 6-A. He was then wrecked by Assault Mode Meliodas, who was then one-shot by High Noon Escanor.
Then there's the Supreme Deity, whose weakened state is 4x more powerful than HN Escanor.
So anyone ~2x stronger than the ~380 teraton dude would be 6-A. After that, someone would only need to be ~5.8x stronger than baseline 6-A to be High 6-A.
If it were me, I'd probably do something like this:
~380 teraton guy: High 6-B
LM Escanor (way stronger than the ~380 teraton guy): At least High 6-B, possibly 6-A
AM Meliodas (kicked the crap out of LM Escanor): Likely 6-A
HN Escanor (one-shot AM Meliodas): 6-A (maybe throw a "possibly higher" in there if he's that much more powerful, but that's kinda pushing it)
Weakened Supreme Deity and Demon King (4x stronger than HN Escanor): Likely High 6-A
This is the way I'd go about it, but I don't read the series. This is just my perspective of that thread and the scaling provided on the pages