Let's assume all Seraphim are YC1 level.
Navy:
- Akainu, Kizaru, Ryokugyu, Fuji
- Old Garp and Old Sengoku
- Seraphim Shichibukai that make up for the YC1
- Vice Admirals deal with Veterans
- Pacifista and regular soldiers beat the rest.
The Navy is at least safely beating 3 Yonkou crews if not all.
Nah, at best 2.
Each Emperor can handle 2 Admirals.
Garp and Sengoku are retired, still, they aren't Admirals, maybe inbetween Yc 1 and Admiral.
And with the Seraphim, we'll, they will defeat the commanders for sure.
3 Emperors is to much, 2 they will win with high diff.