I was wondering to myself when kabuto said that Itachi had several secrets that could stop this was I was wonderin if it was somthing pertaining to the scroll suigetsu and jugo found:shrug
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it is possible but i'm so anxious to know what it isWe notice that itachi worked with tobi to kill the uchiha clan, so maybe it is something to do with this? maybe cose tobi needed all those sharingans or something? we see how he used those sharingans in these dead jinchuurikis and turned some into rinnegans :shrug: