Whitebeard had 16 Commanders. And one of them lost to Moria (IRC).
Imo Oda didn’t plan out the structure of the Yonko crews before he created the WBP. Look at the structure of the BMP, BP, and RHP. The structure of these three crews is: 1 captain, 3 commanders right below the captain, 6 elite officers right below the commanders, and then a few dozen officers below the elite officers.
The structure of the BMP is:
BM
The Sweet 3
The Veterans (Snack and Streusen included)
The Ministers
The fodders
The structure of the BP is:
Kaido
The 3 Lead Performers
The Flying 6
The Headliners/Numbers
The fodders (Gifters are just elite fodder)
The structure of the RHP is:
Shanks
Beckman, Roo, and Yasopp
The other 6 guys shown at MF
We don’t know much about the rest of Shanks crew, but the only difference between his and Kaido and BM’s crews is probably that he doesn’t have an army, but his top members are probably stronger overall than their top members
The BBP are also pretty similar to these 3 crews, which have a distinct top 10. BB has a distinct top 11, but close enough