is one piece episode 657 filler?

Bartolomeo continues to try to find Luffy while he imagines meeting the other Straw Hats. He notices all the other fighters from previous blocks not anywhere to be found and stumbles upon a infirmary room with various Block C losers.

He briefly mocks them before leaving. Meanwhile, Sai demands to know why his grandfather hasn't left the surgery yet.

The guards state that he exited through a different room, which Sai accepts and profusely over-apologizes for.