is one piece episode 591 filler?

Franky is trying to get used to being in Chopper's body. He manages to change into Guard Point, and comments on how unstable Chopper's body is with all of its different forms.

Chopper responds that he is used to it. The children roll Franky around in the snow, while Luffy rides on top of him.

Sanji learns from Brook that the samurai has left to find his torso, and becomes worried for his safety as he has no means of defending himself with just his head and legs, while Sanji held himself responsible for his safety when he was just a head.