I think Marines will come in TWO groups. One in the middle of war. And one at the VERY END of arc.
- First, I do not believe that Fujitora / GreenBull / Akainu will go to Wano. In case of Fujitora & GreenBull, I'm a firm believer that Fujitora and Greenbull are actually gonna be heading to Mihawk & Hancock.
- In case of Fujitora, I think Fujitora's card is somewhat burned since his whole existence as a marine navy was to abolish shichibukai system. and he accomplished that. Which means his purpose as a character was served, and the only thing left is to showcase his full strength and his backstory of why he cut his eyes. So, I'm a firm believer that since his card is somewhat burned, Oda will demonstrate Mihawk's swordsmanship on Fujitora who is probably heading to Mihawk.
- In case of Greenbull, the guy is still mysterious, so there is no way he will be done in by another character. However, considering Oda showcased him talking about beautiful women, then I'm assuming he's leading the charge of the ships that Coby is in, and he's after Hancock. I'm a believer that Hancock as a character will be captured once again, and then Luffy will have the chance to repay his debt to her and save her considering that her identity as a former slave of Tenryuubito can be highlighted and Luffy after Wano will probably have the strength to save her as an official Yonko.
- In case of Akainu, I have no reason to believe that the Fleet admiral himself will head to Wano. And he himself as of this moment is not with the idea of interfering with Wano, which is why Kizaru is STILL NOT YET going there. However, Kizaru will lead a charge at the VERY END of the arc when things are all set and done.
- On the other hand, there is a marine character whom was involved with Rox before, and EVEN at old age, I can imagine he would give the SH alliance a BIG BOOST. Which is the hero of the marine, Garp who was responsible for defeating Rox. And his own grandson is involved here.
Also, we know that Garp talked numerous times about him being Vice admiral because he's got more freedom, and we know Garp does things on his whim, and doesn't listen to superiors. So, him actually going to Wano and not listening to Sakazuki's order is not something farfetched to imagine.
Which is why I believe the Marine involvement of Marines will be in two Groups:
1- Garp's group: We may finally see what Bogard, his right hand man can do hahahahaha. I think Garp will arrive right after the fail of the SH alliance, and when they need to regroup after their first failure i their attack against Kaido and Big Mom. Meaning this upcoming attack, there will be major failure, and Luffy will lose against Kaido/Big Mom. And the alliance will try to regroup, and in that moment, I believe that a BIG BACK UP will show up in the form of (Marco and some characters he came with, maybe Weevle after he beat his ass lol, Garp's group, as well as Jinbe's group with SH grand fleet). this will be a major back up after a huuuuuge loss for the alliance and many were defeated already and lost a lot of numbers. The battle will continue on and on until the end
2- I think the second group will be lead by Kizaru, but after Akainu gets intel from people of the marine inside Wano that he needs to make a move now since Big Mom/Kaido are on the verge of defeated IF NOT defeated already by the alliance. The Marines coming in, and actually marking their official entrance as well as trying to make Wano as a country having a direct contact with Navy, will mark the official "opening the border of Wano Kuni" dream of Oden true. So, I think that Luffy will mark Wano as his own territory as a new yonko, BUT he is not someone who would object for Marines to set foot on it, and Wano itself may actually want their border to open for marines to come. As they may get affiliated with WG. So, Oda can somehow spin it in his own way, I don't know how though hahahaha
Regardless, I have a feeling that despite Garp's BIG HELP in this war with Luffy. I'm a firm believer that Garp will DIE in this war, and he is the big death for Luffy in this arc. Though Oda can be a bastard and kill more than Garp, since it would be bigger than Marineford (WB and Ace). Oda may kill Garp along with 2 or 3 other prominant characters. Law is a famous candidate, though I never cared about him dead or alive.
If I had to choose people from our side getting killed in this upcoming war, I'd choose one from each factions:
1- Garp (Biggest kill)
2- Drake from Supernova instead of Law (Fans are gonna hate me hahaha). Usually that's the end of spies, they die sadly and in heroic ways.
3- One of the SH grand fleet captains
4- One of the Scabbards (Izo, cause WB pirates are finished, and Kiku is the living spirit who will inherit Izo's will)
