Board Thread:Versus Debates/@comment-34277398-20180509212801/@comment-4080775-20180514165637

Itachi didn't release himself from ET on purpose though. It's just that Naruto encountered Itachi and Kotoamatsukami was programmed to trigger upon encountering his MS design, as Itachi expected Sasuke to obtain his eyes.

Mei stated that there was seemingly a connection between Kotoamatsukami and the technique used to control Yagura Karatachi. As such, it can be said that Obito possesses genjutsu prowess on par with Kotoamatsukami. Itachi doesn't possess such prowess without Shisui's eye, and Tsukuyomi definitely isn't comparable to it.