is one piece episode 667 filler?

In the Colosseum, it is announced that Diamante will be making an appearance. Upon hearing this the crowd begins to cheer for him.

Meanwhile, the fighters of block D that got injured are being rushed to the infirmary and along with them is Cavendish who is still asleep. Rebecca goes to tell Lucy that she has made it to the finals, but she immediately notices something different about Lucy.

Sabo who is dressed as Lucy says that he more or less knows about Rebecca and that things could get messy in the finals and he cannot guarantee her safety.