@King:
Luffy is probably stronger than the dukes anyway, especially with Gear 4th.
But the point is that Luffy needs to look good against Jack if he wants credibility when he eventually faces Big Mom in order to get Sanji back.
Sure Luffy is stronger than those two but I dont want to see Gear 4th getting activated against Jack.
Luffy already looks great with what he shown against Doflamingo. But lets stick to each other opinions and see how arc will unfold.
For me fight of Jack vs Luffy and Zoro would be way more interesting than Jack vs Luffy or Jack vs Zoro.
I want to see that Jack is powerhouse and that both Zoro and Luffy even working together WITHOUT Luffy using Gear 4th have problems dealing with him as he is somebody who needs to get overpowered to be put down and its not easy as he is hinted to be somebody who could face an admiral and see the day.
Same as Jozu for example was shown during war(even if he was catched off guard because of Whitebeard almost dying). Jack is same tier for me as Jozu was and those people need incredible firepower to be put down fast. Like Doflamingo who had to be put down with King Kong Gun and everything else he could have tanked or saved himself with strings patching up. Jack in my opinion is hinted to be way more durable than Doflamingo(doesnt mean way stronger or more dangerous fighter as I think that Doflamingo is somewhat equal to likes of Jack, Jozu, Marco and few others). Thats all.
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@sanji''s_dad:
law,bepo and zoro will take jack down since luffy will take a sanji rescue group and will not be on the island at the time.
Zoro and Law taking down Jack can be visually interesting.
Jack is dual wielding swords so I could picture him fighting Law and Zoro somehow. Could be very cool. Nice idea.