I've seen many posts of people saying that Luffy will go against the supernova alliance because they're aiming to take out Shanks. I pretty much think that is wrong. I don't think Luffy would want to "protect" Shanks from basic pirate business. In fact, I think it lines up with Luffy's personality too well that he would fight him and take him out if given the chance. Luffy sure does hate Blackbeard and would love to kick him for what he did to Ace but its not like he's dedicating his life for it or something.. I'm getting the vibes that he understand that this is pirates life, and theres no way around it. Even Sabo didn't show all that much hatred for Blackbeard himself. He didn't kill or capture Burgess and he didn't say something like he's pledging to take out Blackbeard either. So yeah, if Luffy. Vs. Alliance happens it won't be because of Shanks.
Theories regarding the Yonkos and Kaido most of all.
-
-
I'm going on a limb here and say Big Mom is the first yonkou to go down.
Kaidou's conflict with Luffy will make them have the final fight on Fishman island to destroy it.
But for that they have to get Jimbe first, they can't just destroy F1 with jimbei at big mom. There also the fact that it's too early to return to F1 after Wano country.