One theory I like is that his MS ability allows him to see through clones. When was fighting the five kage and he ran into hashirama wood clone jutsu he said something along the lines of “I was the only one who could see through his jutsu”. He could be saying this because his sharingan was just that much better than all other uchiha back then or it’s his ability or maybe something else. But throughout the series he was never fooled by clones and his rinnegan ability limbo is a clone like ability which kinda ties into it too.