User blog comment:Nick D Wolfwood/inconsistencies in the world of Bleach/@comment-1351982-20100702235454

@Cyanide is Love The only reason the now deceased guy could see Aizen was because they were in the Soul Society. If you remember when a non-dead person enters the soul society their body is converted into spirit particles, thus becoming a "soul" and souls can see other souls, so in most cases if you are dead you can see other dead people. And Keigo has stated in the past(aka beginning of arrancar arc - present) he has been able to "feel" things. Not as much as Tatsuki, but he can feel slight spiritual presence.