Mihawk - Relies on Shanks' existence, no one in the world except Zoro as competition for his throne, refuses to fight anyone competent
Katakuri - Literally a fraud by design
Garp - Training for and sweating bullets against a 500 mil pirate in his prime, but we're supposed to believe he's Roger equal somehow
Big Mom - Top tier only off panel, Meme on panel
Kaidou - 1v1 bet on Kaidou if a hostage is involved*
Top 5 off the top of my head