Let's Imagine a full health Uchiha Itachi , EMS , along with Uchiha Shisui (MS) VS a full health Namikaze Minato along with 3rd raikage !
Dude , Kotoamatsukami really IS a wonderful Genjutsu ! BUT !! why will he waste Chakra , Simply ,Shisui of the Shunshin can deal with Minato's Hiraishin no jutsu , while Itachi Backing Up with Amaterasu (Or susanoo Vs Raikage )and he will Know Exactly when to release Tsukuyomi and end the Duel for good (A)shisui has kotoamatsuki and itachi ems.
one the strongest genjutsu and another tsukiyomi at the same time and thats it.
You have got to be kidding me. :|minato alone pawns them both.