Apart from rikudou enhanced ninjas's,who can sense muu,for me it's only the contact sensors,coz someone was saying in a matchup between muu and minato,that minato senses muu despite ohnoki stating he wipes of his existence,and muu told ohnoki to get a sensor that his sensing is futile,he should get the kazekage,which means ohnoki is a sensor but could'nt sense him,so what do y'all think?