Imu
5 Gorosei + 9 Holy Knights
7 Seraphims(Final versions) + Kong + CP-0(Lucci etc) + WG army of 190+ countries allied with WG
^^(S Hawk final version will surpass Mihawk...Zoro will beat Mihawk & become WSS & will defeat S Hawk final version[which will be stronger than even Mihawk] to reach or surpass Sword God Ryuma level hype).
Akainu + Kizaru + Fujitora + Ryukogya + Sengoku + Garp + 100,000+ Navy soldiers.
vs
Shanks & RHP + Mihawk & Crocodile
Here is how i see the battle proceeding:-
>>Shanks's CoC should be more than enough to take out all 100,000+ Navy soldiers & even WG army of 190+ countries allied with WG.
Mihawk's CoC will also be there to get rid of all the fodders on top of Shanks' CoC.
>>At this point if Gorosei order S Hawk(Final EOS version) to intercept Mihawk rightaway, then thats it. Mihawk will have his hands full for the rest of the war. S Hawk alone will extreme diff beat Mihawk.
>>Ryukogya is more than enough for Crocodile. So that's end for Cross Guild.
>> Kizaru + Sengoku is more than enough to take down Ben Beckman.
>> EOS versions of remaining 6 Seraphims + Akainu + 9 Holy Knights vs Shanks. This is too much for even Shanks in my opinion.
>> Fujitora + Garp + Kong are stonger than RHP(now that shanks & Ben Beckman have their hands full).
>> If defying all expectations anyone of the [Shanks & RHP + Mihawk & Crocodile] is still left standing very weakened now ofcourse,
then just VAs are enough. If still not enough , then just 1 Gorosei will casually end it all.
Conclusion:- Imu & 5 Gorosei won't even have to make a single move & [Shanks & RHP + Mihawk & Crocodile] will bite the dust.
That's how insanely strong the WG is. No one has been able to take them down in last 800 years.
In Shanks & Mihawk we have essentially 2 Yonkos attacking headon & yet they along with their groups behind them will still not be able to see even the face of Imu.
A more interesting matchup will be if :-
Scenario 1) Mihawk + Shanks + Kaido + Big Mom(no mother mode or hunger tantrums mode) + Dragon all team up & attack Navy + WG. Mihawk with Cross Guild behind him. Shanks , Kaido , Big Mom with RHP, Beast Pirates & BMP behind them & Dragon with RA behind him.
Scenario 2) Prime Xebec + Prime Roger + Prime Whitebeard + Prime Rayleigh + Prime Oden + Prime Scooper Gaban . These 6 alone attack Navy + WG. (In this case, gotta give Navy Prime Garp , Prime Sengoku ,Prime Kong & no Akainu,Kizaru,Aokiji say they were all VA level).
Final Conclusion:- Even becoming PK isn't enough to take down Navy + WG. You need to be Joyoboy Nika full potential unleashed level & have a few Ancient weapons & lots of very powerful allies (eg. I believe that the Elbaf Army of Giants & Prince Loki will ally themselves with Luffy).