is one piece episode 888 filler?

A disguised Sabo successfully infiltrates Pangaea Castle as he goes through the Celestial Dragon Gate with other guards after a request was made for reinforcements. Inside, he splits from the group and surveys the castle, taking pictures with a special Den Den Mushi.

He ends up running into a guard, who confronts him, but he quickly takes out the guard with Ryusoken and places him back at the door. Karasu then flies and makes a racket right outside, causing Sabo to head toward an exit.