is one piece episode 251 filler?

At his base, Franky finally recognizes Spandam's voice and Spandam is eager to see Franky at Enies Lobby to teach him a lesson. Spandam then slashes at a nearby lamp with his sword but the candle ends up burning him and he hangs up the Den Den Mushi.

Kaku then has Blueno tie up Franky and Rob Lucci leads the other CP9 agents out. However, before they can go any further, Usopp suddenly speaks up and demands the agents to let Franky go.

Lucci simply turns to Usopp with a defying stare and Usopp quickly apologizes much to Franky's disappointment.