Chapter 811 showed us Jack and his pirates defeating the Minks with Caesar Clown's poison gas. Jack then proceeded to severing Duke Inuarashi's leg and Master Nekomamushi's arm. Being the most gruesome chapter since 769, when Doflamingo severed Law's arm, the chapter taught us something about Jack and the Kaido Pirates as a whole: They are ruthless and relentless.
With that being said, the Strawhats will need an army to defeat them. In chapter 810, we saw that no matter how many of the Kaido Pirates the Minks defeated, reinforcements kept arriving onto Zoe.
What is Inuarashi and Nekomamushi's role in this arc? This is a mystery brought up when Pedro says that their voices are waiting to be heard around the world in chapter 810's flashback.