If you remove Garp I agree with this
The Red Scabbards do some level of Kaido's strongest moves and had legit counters to them.
Most VAs would have gotten smoked, and NONE have any serious damage potential to Kaido.
Devil Fruits with Wills are actively avoiding the World Government because it's run by child-sex-trafficking fascists, the only Marine forces with strong Devil Fruits are very motivated/caring individuals.
For all the faults I have with the Red Scabbards (except Kanjuro, jerk) they were always fighting for the right thing. Oda just did them dirty in Act 3 (I liked them in Acts 1 and 2, and hopefully will like them in Act 4), they were really cool characters with a lot of potential.
Kinemon, Neko, Inu, and Kiku had fulfilling character arcs for me, especially with the anime included, but the others got shafted.
Oh my gosh for the first time I just realized "shafted" means men, who have shafts, or dicks, censoring history to make it more masculine. ugh.