They were still fighting in chapter 633
The problem is this tendency of his has left us with more questions than answers and we are seemingly nearing the end of the manga. Its just bad writting.

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The problem is this tendency of his has left us with more questions than answers and we are seemingly nearing the end of the manga. Its just bad writting.
Yeah, I'm not stoked about seeing them. I expected their return to have more weight or be specila.
Doesn't help they appear in a scene where everyone is trying to suck Shanks' D.