is one piece episode 321 filler?

After Zambai and the Franky Family beg Luffy to take Franky with them, now that he is wanted, Luffy calmly agrees since he had been seeking a shipwright anyway. But Zambai realizes (after watching him last night) that convincing him will be another matter.

Leaving Mozu and Kiwi behind, they proceed towards the Franky House (where Franky is returning right now), saying what they are about to do is a matter between men. As the Straw Hat Pirates prepare to leave, Roronoa Zoro reminds them of their stance regarding Usopp.

Urged on by Mozu and Kiwi, they make their way to Scrap Island.