i am pretty sure Saturn will lose badly because Kuma land VP have a backup plan. i can imagine that Kuma has the authority 0 and that is why VP ordered VP to erase his memory. but VP and Kuma are no idiots. so when Kuma comes back he will take his memories back and order the Pacifista and...
if you ask me Sanji having CoC haki is the smallest problem he is still very strong , the problem is all others weaker than Jinbe they are too weak compared to the top crew , no one of them can use CoA haki and Oda didn't have time to make them professional at using it.
Who will fight Saturn? obviously the science fraction:
Bonney since she has a grudge against The Gorosei
Sanji and Franky both are based on science
Vegapunk and his clones
the ancient Cyborg since he is awaken he will come to protect Luffy since Saturn will go after him.
and at the End Kuma...
If i predict correctly, Saturn will overwrite Atlas' command right away. and Kuma will come and send Luffy to Elbaf including York and Sentomaru.
well that would be the easiest outcome.
and the other will be the grandfleet will come and defeat the marines while Luffy and Co defeat Kizaru and Co.
well that possible but what can he do against someone like Akainu , he is just programmed weapon. don't really think anymore.
Kuma's main body still conntected to either to the Serphim or to his conciousness in egghead. and because of that he decided to go the MG the moment CP-0 used the...
i think there is a catch to Kuma's demise. To be honest i think there is a back plan of VP and Kuma.
so if the WG kills him it will activate something like all Pacifistas or another serphims will rebel and the WG forces command chips will not work anymore.
so killing Kuma could be the biggest...
i have a hunch that Dragon is gonna come the reason is Luffy is not only against the marine but against the CP-0 and the Gorosei and more he was called directly at the beginning and you can be sure he is far powerful than the admirals , just look how powerful is his dad even as an old man.