Every Yonkou has 3-4 strongest guys under them. Coincidence?
What is so hard to understand about the VA example?
You say all WB commanders are as strong as Marco, because they have the same rang. Which is clearly not the chase unless you are blind or something.
VA also have all the same rang, but the strength differs strongly. You have guys like Maynard and then people like Garp, Momousagi, Chaton, Tsuru etc. etc. - who are much stronger than Maynard, but they stil have the same rang.
Curiel couldn't defeat Moria, while Jimbei one shoted him. Yeah, Curiel is as strong as Marco, Jozu and Vista lmao