is one piece episode 461 filler?

Three other ships, along with the Moby Dick, have infiltrated the bay. Whitebeard himself from the deck of the Moby Dick, comments that it would be better if his son, Fire Fist Ace, is alright.

Ivankov asks Luffy if Monkey D. Dragon will come and save Ace, as he would never let his son get killed.

Luffy replies that although his father is Dragon, Ace's father is in fact Gol D. Roger.

Ace then remembers all the events that led him to being the Whitebeard Pirates' Second Division commander.