Board Thread:Episode Discussions/@comment-1181222-20170830100203/@comment-734582-20170903095558

Mr. Grave wrote: No. My argument was that the Sharingan is just as convenient and OP as TB, but it is way more accessible and user-friendly than having a demon inside you who hates your guts. I think it's roughly comparable. The Sharingan is more accessible, sure, but it's also more limited. Kyubi gives virtually infinite power, but does so at higher risks. The Sharingan gives more mundane utility but also doesn't risk your very autonomy. Mr. Grave wrote: Otherwise, Itachi wouldn't have awakened it when Shisui died considering the person closest to him at the time was Sasuke. Is it also nowhere mentioned that the person needs to lose a dream associated with the person - it may be true, but until the series states that is the case then it is your headcanon. That Sasuke is the closest to him is your headcanon though. Itachi barely paid Sasuke any attention back then and in stead was busy spying for the Uchiha and averting the coup. He spent way more time with Shisui in those days, and it makes more sense that Shisui was the closest to him.

Besides, if it only took someone close to you, the Uchiha clan would be filled with MS users. But it's not, suggesting that the actual circumstances are rarer than expected. Especially since MS users have awoken the dojutsu in others without fail, suggesting that it's the circumstances that are crucial.