Touch is shown from inosuke while sight is seen from Kanao
mmm iunno for sure about those 2. I mean I can say those 2 myself but its sorta power ranger-y. (being around the same age passing the trials together etc etc.) With Tanjiro and Zenitsu, their senses are already activated without using skills and then Genya who can eat demons is kinda not directly a skill but a genetic trait as well.
Inosuke i can maybe say is plausible but there's never definitive proof that its not just someone enhancing their senses especially since he was raised in the wild by boars. And Kanao's sight ability was just a final form of her breathing:"Final Form: Equinoctial Vermilion Eye", not necesarily something that says she has unnatural eye sight.
mmm so thats the potential of sight... i wonder if the other senses can be brought to that level. I know senses are a theme in this story, and smell, hearing and potentially taste are shown. (i dunno if touch is shown and the current person with sight is missing... but i cant wait til they finally reveal more about this obvious oddity)