Fun fact.
They called the Flying 6 because they thought they would be enough to capture Yamato, but later we have Jack saying something like "even one scabbard is dangerous for a Flying 6".
Not much do to with what we saying here, but it just popped in my mind.
Yes and no.
The entire structure around Kaido's crew is built around strenght and shifts of hierarchy, which is something that I REALLY dislike about Oda's portrayal of the Beast Pirates. We get people in certain positions and that's it. We don't get "former calamities" among the flying 6, or "former flying 6", or someone that rivals a flying 6 and they often shift positions because they constantly challenge each other, etc.
I find this lack of "movement" among the Beast Pirates quite retarded and shows a lack of interest of properly developing the crew's structure.
Having said that, ALL Flying 6 are, at some level, "rivals" to each other. The thing is that Sasaki and WhosWho are the only ones who openly desire the position of Calamity. The fact that they DESIRE it doesn't mean they are STRONGER than the others, despite the fact that Oda decided to portray them in such a manner.