Wait are you agreeing or disagreeing? Also no it wasn’t Doppo was doing well against Yujiro and Yujiro wasn’t casual at all in the fight. It’s once Yujiro used the DB you know the huge ass amp that’s when he no diff Doppo. Again look at the my fight breakdown
Agreeing that the 'prime doppo' statement is irrelevant because even the narrator said 'may be', did not say 'explicitly this is his last year at his prime'.
Agreeing with other guy that doppo scales to the yujiro who supposedly stopped an earthquake with a punch (I seem to remember this was considered coincidence at one point)
Disagreeing with other guy then listing everyone yujiro didn't 1 shot regardless of how far in story it was and if he used back or not.
And yujiro not using demon back is him holding back. A fairly casual thing to do. He got kind of pissy when he got hit with a few attacks that all magically healed within a single panel of them happening but the very instant he actually used demon back (not holding back) he very casually murdered doppo. Its not at all comparable to characters who fought him with demon back and stood a chance.
As for the 'everyone is 7c because doppo cut that yujiro twice in his fight' thing, eh, that's hard to really get a concrete answer on. I don't believe in outliters in verses with literally 1 author; if yujiro did stop that earthquake, and doppo made him bleed, those are things that objectively happened, the author objectively wrote that scenario and made it canon. But it does create issues later when yujiro is explicitly stated to be stronger than the yujiro who did this and therefore the doppo who forced him to use demon back. It really doesn't seem that out there though.
Speaking of that calc, the earthquake one, its iffy to begin with. Almost every post on it says its not really useable and the calc itself says 'its not calcable, I'll just say he scales to earthquake strength for stopping it because ???'. You don't stop an earthquake by applying pressure in a very small spot directly above it. And if you did, it wouldn't be the same strength used as the earthquake.
Yujiro himself having the scaling he has feels incredibly arbitary.