Board Thread:Theories and Speculation/@comment-29769110-20170115161829/@comment-3965545-20170116021640

The 10 year Cool down only exists for people other than Shisui himself. Considering he is only 2-4 years older than Itachi and he got his MS at the end of the 3rd war, the 10 year thing is bs.. besides it was in a damn crow so of course a crow would only be able to use it every 10 years. it just means Itachi used the crow around 10 years before the day when it was used for him as an Edo. Therefor Itachi used that crow on SOMEBODY soon after Shisui died.. at least he attempted to use it. I'd guess you have to be at the least blood cousins to get the EMS.. as siblings were the only confirmed ones that actually tried it while having the MS before.