@Levi, the Navy + the shichibukai = 4 yonko.
When Schichibukai were disbanded, it's because the Navy headquarters had a new force capable of stopping the yonko according to Kaido.
Now, let's not even ignore for a second that:
- World's strongest man = yonko
- World's strongest creature = yonko
- World's strongest swordsman = strength of Cross Guild (yonko crew)
- Closest rival to WSS who scared off an admiral = yonko
- World's future pirate king / JoyBoy = yonko
- World's only multiple devil fruit eater, including WSM's = yonko
Yet, admiral = yonko is apparently logical.
Like bring me some good arguments into the table and I may reconsider my opinion.