Board Thread:Versus Debates/@comment-26636534-20180205153025/@comment-26636534-20180208093739

Gyuki broke Bee out of Sasuke's MS genjutsu and broke Bee out of edo Itachi's genjutsu before his shuriken got close. In the Sasuke vs Bee instance, Bee explained how genjutsu is useless to a perfect Jinchuriki.

Furthermore, Menma has the nine masked beasts. This according to Chiyo's words, multiple allies can overcome sharingan genjutsu, makes effective genjutsu quite unlikely. Plus, Menma has unrestricted access to Black Kurama's power, meaning if his chakra is disturbed by genjutsu, he can easily reset his chakra with Kurama's chakra. In addition, Menma has Obito's MS, which can see through genjutsu and was powerful enough to control Kurama and Yagura.

Considering all of this, Itachi's genjutsu would be highly ineffective.

Scenario: Itachi and Menma face off. Itachi throws his kunai at Menma, which Menma using telekinesis stops. Menma unleashes the nine masked beasts. This makes sharingan genjutsu effectively useless. Itachi manages to dodge the beasts' attacks and starts using elemental ninjutsu.

Menma would then switch to spiraling-ring and hurl it at Itachi, Itachi would obviously dodge, but his ninjutsu would be overpowered. Itachi would prepare Amaterasu at this point, with Menma and the nine masked beasts staring him down.