Yeah and where do you suggest he put it? This is a general question. So I believe he did put it in the right section.
Instead of just pointing the finger maybe you should open your mouth and speak words of wisdom. We are a community and as such we should help each other out not diss and dismiss.
This question actually got me thinking, as of what we know now, no. An only Uchiha child couldn't. But Up until we saw Kakashi's MS/Sasuke awaken his MS, we also believed that you had to kill your best friend to awaken that. The Uchiha are a war driven clan so it's not suprising that they only way they say to be able to awaken MS/EMS is to kill you Best friend/Brother. Therefore preparing you for the death of others. But there possibly be another way to awaken it. But we might never know.
I think so. So far, the only people able to get EMS had a brother, but in the manga, I think it said a close relative or "clansman" was the exact words. But it also said that sometimes it didn't always work. So, who knows?