End of series power levels without Gorosei and Dragon due to ambiguous nature of their powers-
1. Imu
2. Luffy
3. Blackbeard
4. Akainu
5. Shanks
6. Zoro
7. Mihawk
8. Kizaru
9. S-Hawk
10. Kaido
11. Big Mom
12. Aokiji
13. Fujitora
14. Greenbull
15. Sabo
16. Coby
If you include Gorosei Kaido is already 15. Garling and potentially some of the Knights are also stronger, not even to mention Primebeard and Primegarp, Prime Roger-Rayleigh-Gaban
1. Imu
2. Luffy
3. Blackbeard
4. Akainu
5. Shanks
6. Zoro
7. Mihawk
8. Kizaru
9. S-Hawk
10. Kaido
11. Big Mom
12. Aokiji
13. Fujitora
14. Greenbull
15. Sabo
16. Coby
If you include Gorosei Kaido is already 15. Garling and potentially some of the Knights are also stronger, not even to mention Primebeard and Primegarp, Prime Roger-Rayleigh-Gaban