The Hashira do not know why Guest keeps one eye covered. They have no idea at all. Sanemi Shinazugawa: Hah? Why don't you take off that eyesore of a patch already? Obanai Iguro: I don't trust you. You can't even show your face. Take off the patch. Giyu Tomioka: ... Muichiro Tokito: What was the name of that cloud again...? Kyojuro Rengoku: Hmm! Guest! It is time you removed that eyepatch! Gyomei Himejima: Ah... Namu Amida Butsu... Could you please remove the patch...? Mitsuri Kanroji: Would it really hurt to show us your other eye?! Shinobu Kocho: Ara~ ara~ Guest-san~ our patience has its limits too, you know?