@.access:
People thinking Jack is not gonna be defeated by Luffy: I suppose you think that because you believe Jack will not be dealt with in Zou, but only in Wano - when Luffy will be too busy fighting Kaidou.
If that's the case, who do you think will be fighting the other two calamities (King and Queen, or whatever they are called)? Because if Zoro and Law need to pair up to fight one them, I can't see who else from the group could have a chance against the other two.
jack attacking zou when luffy is away would give the people that stay behind on zou something interesting to do after all he cannot take a huge army away with him too all cake island since they're sneaking in to get sanji and a copy of the ponyglyph if jack attacks while luffy is there then they will send another calamite or drake but jack has been built up as the arc boss for zou
luffy said himself that he would be sneaking in and people have been saying he would take the ninja with before we even saw raizo ninjas being good at stealth missions and all lol.
zoro has not gone all out in a fight before besides law will be there to back him up like how he helped luffy vs doflamingo and luffy will be going to big mom's island so he might even mess up and have a 1vs1 against her even though he will not win so raizo or sanji will have to grab him and escape.
–- Update From New Post Merge ---
@Screwtape:
I really hope this conclusion on Oden does not lead to a long flashback [It shouldn't].
Seriously, Luffy got to go and hurry up and get Sanji and get the copy of the graph [if possible] from Mom. While preparing with Law for Kaido.
What makes you think Zoro and Law needs to team up to fight one of the calamities when they are just as strong as Luffy?
They don't need to just like how luffy might have taken doflamingo out without law's help but after what jack did to bepo law's crew mate homeland it makes sense for him to get involved and Bepo might jump in the fight as well besides zoro can 1vs1 another calamite when they take kaido down.
Jack fights with weapons like Zoro and also seems to have a hybrid form where he can use his two mammoth tusks as weapons giving him 4 weapons (six if he also uses the horns on his head) vs Zoro's 3 so it makes sense for Zoro to get him and how is Luffy going to beat the Yonko when his crew or allies cannot take out the people working under them?