is one piece episode 678 filler?

As Donquixote Doflamingo's severed head falls to the ground, those present express shock while Kyros proclaims they have suffered for a decade. Buffalo attempts to attack Kyros, who holds him at swordpoint before telling all of Doflamingo's subordinates that he is going to expose all of their deceptions.

As Monkey D. Luffy dejectedly notes that he did not have a chance to beat up Doflamingo before he died, several soldiers discover him and Violet hiding behind a window and open fire on them, prompting Luffy to grab Violet while proclaiming they will save Trafalgar Law.