What do you think Killers next role in wano is?
For now, he'll evacuate the tower with the rest of Kidd Pirates.
After that I see only 2 possible scenarios:
- Reaches Kidd and Law and supports them against Linlin, I used to be pretty confident about it but after the words of this chapter I think he wants to leave Linlin to Kidd (and Law
- Push back the BMP. They will arrive at some point probably after Onigashima landing and the battle will keep going... By that moment only Kaido and Big Mom will be still active (maybe King and Queen too) so Killer will basically be the leader of the resistence against the BMP. I could see him fighting Smoothie (not necessarily defeat her, but for sure pushing her back until Kaido and Linlin are down and the war ends).