Board Thread:Naruto Discussions/@comment-26403664-20160228225013/@comment-681696-20160315175344

Thekillman wrote:

It's the only logic we can use. Else, anything can be claimed. Jiraiya uses Rasenshuriken, because he hasn't been shown not to use it. Orochimaru uses FTG. Hiruzen has Wood Release. etc etc etc

It's not impossible for Itachi to awaken PS, had he lived longer. That's not the same as being able to use it. E.g. Minato would've probably mastered Sage Mode and Rasenshuriken eventually as well.

The only thing that can be claimed as fact are what is shown in the manga anything else is just fanon so any answer to question of Itachi using PS is fanon all we can say is that we don't think he can use PS and state our reasons way we think that.