Calling them YC3.5 doesn't add validity to their standings. You can stop that, because Jack is able to fight against someone on Inuarashi's level for 5 days. Inuarashi was panting after 12 hours. Cracker's Haki could cut Boundman. The Dukes and Ashura Doji don't have feats to put them on that level.
Yes. That's a point that makes Denjiro questionable, because it looks easy for the likes of the Mid Trio. Brook, a member of said Mid Trio, would be no diffed by someone like Perospero. So how do you factor that in?
I'm saying defeating a fortress of fodder isn't impressive.
??? He said they were supposed to be the first difficult task according to the B.D.A. translation. Not that it was impossible. I don't understand where you're pulling that out of.
And Kaido's YC1 is King. Kaido Jr.'s age isn't even known, what if he's only as old as Momo? You're making plenty of leaps over a single speech bubble where Kaido groans about his son not being present. Meanwhile, for Katakuri's intro, he was labeled as the monster dangerous person at the tea party. Bit of disparity there.