Okey as we've seen on the latest manga chapter ... Madara stated that the Reanimation jutsu has 1 risk... and that is if the one summoned by edo tensei knows the seal of it you can release it... so I'm a little confused as how come, when Orochimaru revived/summoned the Hashirama and Tobirama how come neither of them released themselves ... I mean if Madara knows about this risk ... so should have Hashirama not to Mention Tobirama since he created this jutsu.... Anyone else confused about this?