User blog comment:12th Supernova/Chapter 841: Humanity/@comment-31.24.227.55-20160929165422/@comment-24850639-20160929211225

What makes you think Luffy couldn't give Jack a run for his money? At this point both in the series and the New World, Luffy not being able to do at least that to a Yonko's right hand man is completely unacceptable. Especially after beating someone like Doflamingo, and making his big speech that he's no longer running away from Admirals, Yonko, or anyone. Its time. If actually facing a Yonko is no longer some far off idea, and is a legitimate possibility anywhere he steps in the New World, then we need to get used to that and stop saying its "too soon". From here on out, Luffy will almost exclusively be having his major battles with people Mingo's level, or higher.

Gear 4 note: when Luffy first activated it, he unleashed absolute hell. Culverin cannon, Rhino Schneider, Kong Gun, Leo Bazooka, etc. When it ran out, he only needed 10 mins before he could use it again.....this fight's been going on at least 11 hours. Not to mention Nami is there with her newfound followers, so whatever Luffy's been doing, its been working.