User blog comment:Kaido King of the Beasts/Chapter 902: I Don't Wano More Cake/@comment-35399973-20180425025435

I've been thinking about how Luffy will handle people like Jack. His devil fruit is incredibly good for any sort of power over small opponents considering it's a flipping Mammoth zoan. Would Luffy need to develop a gear capable of clashing with Jack. Unless you count Gear 3rd as being able to fight him. Not sure what Luffy will do but I have a small feeling that he will suprise readers/watchers of one piece by showing a new skill to overpower Jack. And I was also bored with Luffys abilities in the whole cake island arc since he used Gear 4th for every encounter with a very strong opponent. I personally believe that Luffy won't be able to do much to Jack in G4 on the other hand with Gear 3rd he definitely could match him within mass. (Combat wise)

That leaves everyone a question... Gear 3rd, Gear 4th vs. Mammoth Zoan User

Excuse the bad post this is my first post :)