Board Thread:Theories and Speculation/@comment-36512555-20200202084241/@comment-9782468-20200203213039

FlatZone wrote: So giving Itachi that for a feat is just fine. This is your opinion. Imo it doesn't fit with anything else he's done.

Besides, considering they had plenty of opportunity to show him use this in the anime in the multitudes of flashbacks and fillers that touch on this particular event (Uchiha massacre) and still never showed him using it, it doesn't seem like the anime agrees that it's something he can do.

Besides, it makes very little sense for Itachi to use up such a large portion of his chakra to kill one Uchiha, when he still had to kill the entire clan. And after that, he was still talking to who he though was Madara afterwards. Itachi seems like he'd be more about saving as much chakra as possible.

I mean, I can agree that he can probably go past his usage of it on Kakashi for example. I can definitely see a few years in Tsukuyomi time, but I have a hard time believing a lifetime.