Yasuie stating that those who will serve Oden as shogun must be the greatest samurai instead of mere ruffians:
Inuarashi treating Raizo as a samurai both in Zou and in Wano:
The narrator himself saying the Nine Scabbards are nine samurai:
Brook treating Raizo as a samurai:
Bao Huang including Raizo among the samurais:
Kaidou saying he loves the way of the samurai as he fights the Scabbards in reference to them as a whole:
BONUS: Tama addressing herself and her companions as samurai because, surprise, every warrior from Wano is a samurai just like we knew since freaking Zou.
Do I have a point or not?