Board Thread:Naruto Discussions/@comment-26403664-20160228225013/@comment-734582-20160315130939

Tasuxeda wrote: My point was that an absence of evidence is not evidence of absence. If you had paper to cut, you would use scissors. If you didn't use scissors, then it's a fair bet you never had a pair of scissors on you. This isn't "absence of evidence ->evidence of absence" but "if he could've used it he would've used it".

In stead of going all out against Kabuto and using a Perfect Susanoo to overpower him, Itachi didn't. Because he couldn't. Because even with Edo Tensei negating his weaknesses he cannot perform Perfect Susanoo. The ones that could use PS had either EMS or Six Paths chakra.