I don't think Sengoku represents the goat. His codename was Buddha.
Anyway, kind of pooling other people's ideas but I think there is more than we know if we combine the WG/Marines together
- Im
- Gorosei
- Kong
- Kong's subordinates (there are clearly more under him, we got a hint to one that Doflamingo talked to after Marineford, Kong isn't the only WG employee outside of Cipher Pol; not indicating they are stronger than Akainu)
- Fleet Admiral (Akainu)
- Admirals (Fuji, Kizaru, Ryo)
- 7 Zodiac Vice Admirals (Including Momosagi and Chaton, the Sheep, Horse, Rat, Snake and Dragon may exist since the first 2 lost to Fuji/Ryo for the Admiral title and still obtained Admiral codenames)
- Regular VA's (Giant Squad too)
- Rest of the Marines
Then add extrainous groups like CP-0 and SSG, which probably have their own additional hierarchy's. We'll see this as we move closer to the final war stages eventually. If we thought Kaido/BMs groups were huge, this is going to be massive.