Then you are missing my first post. If Sanji is defeating a YC1 with only an RS, which (for the purpose of this debate) is not that significant power-up, then Sanji had to have been YC level at Dressrosa. Because he didn't have any significant battle in WCI that would push him further.
Which is great for me because I can preach Doffy>Katakuri all day then. I can then say with more confidence that Doffy lost due to Law's Gamma Knife.
If you think Sanji winning against King proves King is weaker, then you are wrong. Kaido's crew is a strength-based hierarchy too. Luffy fans are not gonna get away from the fall out of Sanji winning against King.