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Last post i answer to ...Story wise a lot of what you are saying makes no sense .
Luffy is going to help his grandfather protect the group of people that hunting the SH and help kill his brother .
Go against people that save him like ivankov ,inazuma and his next brother plus all the people robin and sanji know since they were with them.
There is more but just think about what sort of character luffy is .
Akainu killed Ace, that's a personal thing. Plus, Ruffy does have a friend within the marines, Corby and "worked" with marines against Cesar on Punk Hazard. So i don't think he has a grudge against the whole organization. And preventing some massive destruction doesn't mean he's not going to rearrange Akainus' face. :]
Sanji was on Newkama Island, while Ivankov is a part of the Revolution, there has been no indication that this means that the Newkama residents are too. Only Inazuma is shown to be a part, too.
And i can see Ivankov fighting Ruffy if (s)he has to, as (s)he is more loyal to Dragon.
Sabo is a wildcard, but i can see him choosing Ruffy over the revolution, as he endangers the operation in Dressrosa for him, see Koala and Hack.
I really think you miss out some details in your thoughts ... the world in One Piece isn't just black or white ...
Not saying that i'm right, just some random thoughts, but there is always a possibility.