is one piece episode 257 filler?

A large wave of Aqua Laguna is about to hit Rocketman and Kokoro asks how everyone else is going to take care of it. Zambai orders the Franky Family to grab cannons and fire at the large wave as it's just water.

Suddenly, Nami gets a call from her Baby Den Den Mushi knowing it's Sanji calling. On the Sea Train Puffing Tom, some Marines are looking over their fallen comrades.

T Bone can be seen now and asks a Marine how he got an injury on his arm. The Marine says he got bit by a bug earlier and T Bone wraps up the wound using a piece from his cape.