(That's a ruling for Zanji.)• "The Six Samurai - Zanji" does not need to remain on the field after battle for its effect to activate. Even if it is destroyed by battle, as long as you control another "Six Samurai" monster, the monster it attacked will be destroyed.
My response.Curtis Shultz said:In example #2, "The Six Samurai - Irou" is sent to the Graveyard at the end of the Damage Step, the same time Zanji's effect is applied. The monster Zanji battled with is destroyed.