I dno where your gettin your info from but it clearly stated in the anime you need senju and uchiha blood i dno about the manga and its dodgy translations but it states in episode 253 at 3.45secs (lol know ur loving my geeky sources)
"only those who possess both the powers of uchiha and senju"
dont get me wrong i like itachi and the uchiha BUT how many times has it been stated not to look into an uchihas eyes
now it seems even tht wont work
youre taught at the start genjutsu works on the 5 senses uchiha specialize in eyesight genjutsu
BUT this inzanami doesnt need 5 senses to genjutsu itachi doesnt even possess an EMS
Im sorry it seems to me kishi created a scenario to balance out kabuto but then made it too hard for the uchihas or couldnt b creative enough and he thought "u know wht f*** it il just make inzanami a new jutsu coming out to change the battle"