is one piece episode 646 filler?

At the Corrida Colosseum, Gatz is heard announcing how Kelly Funk easily took down Boo with his sudden increase in strength. Sai is seen kneeling down to his fallen comarde while Ideo is seen taking out opponents with his explosive punches.

Don Chinjao knocks away opponents in a fit of anger while Luffy (as Lucy) is trying to get his helmet back from Jean the Bandit. Chinjao is still chasing after Luffy wanting to get revenge on Garp's grandson and Jean overhears this now knowing Lucy is indeed "Straw Hat Luffy".