Board Thread:Episode Discussions/@comment-1181222-20170830100203/@comment-734582-20170903072725

Mr. Grave wrote: Except those Sharingan weaknesses that you are bringing up are not Sharingan-induced at all. The argument was that Sasuke didn't pay much for his power, my counterargument is that he did.

Mr. Grave wrote: She does need to experience loss to get MS, yes, but that is not a very big deal by Naruto standards considering almost every major character has lost someone close to them. It seems to me that you need to lose not just someone close to them, but rather THE person closest to them. And even then, it seems you need to lose a major dream associated with that person.

Itachi didn't just loose his best friend, but also any hope of averting the Uchiha massacre.

Sasuke didn't just lose his brother, but also his sole reason to live, as he had set his life in service of killing Itachi.

Obito lost not just Rin, but also his dream of being with her, as he was in love and she the only person who cared for him at all.

We don't know about Madara or Izuna.