is one piece episode 887 filler?

Big Mom contacts Kaidou through Den Den Mushi, telling him that she would be visiting Wano Country to personally kill Luffy. Kaidou objects, claiming that his grudge against Luffy was greater.

Kaidou had previously operated a SMILE fruit operation with Donquixote Doflamingo, but Luffy destroyed the factory, ending the operation. Kaidou wanted to be the one to personally kill Luffy.

However, Big Mom refuses to back down, suggesting that they form an alliance against him.