Cavendish is not weak but he's not that strong too. At best I would place him at the low to mid end of the F6.
Casually carves a mountain with a flying slash on horseback, sits on the couch with Law, Luffy, and Zoro in the color spread, notable speed even in the new world with Hakuba that Barto couldn't even process/see, unphased by Luffy's conquerors, 330,000,000 bounty that survived as an independent captain for multiple years in the New World, has half and half control of Hakuba now a form that one-shotted the likes of Dellinger, was unphased by Gladius/had no stress on his face and called his bombs weak, prevented Hakuba from cutting Robin and then made him submit with his will before escaping an entire cliffside of a bomb while using his speeds momentum to glide and cut his own hand to protect Robin once again from his other half, an insane feat and in split seconds, casually deflected Doffy's string bullets; being the only colosseum fighter to reach the peak of the castle and ultimately the only combatant to be literally unscathed/injured the entire arc bar the self-injury.
Completely clean.
And he commands the first ship of the fleet and was stated by the narrator to be increasing in strength along with the rest, has a meito blade, and this is all without even getting into the rest of his portrayal and character content from Oda.
Vastly underrated by the fandom; just like they undersold and continue to undersell Lucci's ability and clear portrayal.
 
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