If Shanks is more powerful than Kaido then we might as well give up on logic in One Piece
The Worldbuilding is basically killed with this
I gave up on powerscaling when the shichibukai were given 1 billion+ bounties. These guys were either beaten pre-timeskip, or clearly inferior to top commanders in marineford(except Mihawk, Doffy and Kuma)
I anticipate this power creep to run on to vice admirals, unfortunately.
Basically, any character we haven't seen for a while are strong enough to take down Cracker and Jack. Oda really messed up somewhere, and my guess is Wano