is one piece episode 457 filler?

Luffy watches Ace's Vivre card as it continues to burn and starts a conversation with Jinbe. He recalls how both of them had always been together, how they always ate together, slept together, and even tested their skills together.

There is then a flashback of when Luffy and Ace met each other at Arabasta. It shows Ace expressing how he was part of the Whitebeard Pirates, and how the mark on his back was his pride.

Ace tells Luffy that Whitebeard was the strongest pirate that he has ever met, and wants to make him Pirate King, not Luffy.