is bleach episode 20 filler?

In the Seireitei, after relaying Rukia Kuchiki's execution verdict to her in the Sixth Division prison ward, Captain Byakuya Kuchiki walks along a corridor before coming to a halt when 3rd Division Captain Gin Ichimaru praises him for being so calm in the face of his sister's impending execution. As Gin sits on the railing with 11th Division Captain Kenpachi Zaraki standing across from him against the wall, he asserts that Byakuya is a role model for all Shinigami.