Board Thread:Theories and Speculation/@comment-31338621-20200901181802/@comment-46817411-20200928215851

BloodOfTheArchon wrote: Disregard that, Ao was only stating his eye(Byakugan) saw through the Genjutsu placed on the 4th, basically no Genjutsu can go unnoticed by him. Either way Obito's usage of the unnamed Genjutsu was basically retconned, and only used again in the Road to Ninja Movie. Otherwise the 4th War would have ended before it even began.

If no genjutsu could go unnoticed by him then how did Obito control Yagura for years and no one knew? And you gonna have to explain "then the 4th War would have ended before it even began"