Because he thought Itachi could find a use for it I guess.
Remember that he dies pretty much right after that(either suicide, or he has Itachi do it for him). So he has no use for it.
Maybe he though Itachi would use it to get an Eternal Mangekyo.
Because he thought Itachi could find a use for it I guess.
Remember that he dies pretty much right after that(either suicide, or he has Itachi do it for him). So he has no use for it.
Maybe he though Itachi would use it to get an Eternal Mangekyo.