is one piece episode 735 filler?

The citizens of Dressrosa continue celebrating Doflamingo's defeat as Gatz tearfully states that he never expected Doflamingo to be defeated like this before hanging up his Den Den Mushi. Sabo is happily viewing the emerging sun as well, and walks away from a defeated Burgess.

Burgess wonders why Sabo is not going to finish him off, but Sabo feels no need to. However, Burgess tells Sabo that Ace said something to them during his defeat on Banaro Island as Sabo's Den Den Mushi rings.