I wonder why the manga stated, madara and izuna was the first to awaken MS...
but it was said by Tobirama, he had seen many countless times of uchihas awakening power from despair...
Tobirama is also aware of the EMS of sasuke, it only signifies that madara/izuna was not the first to awaken MS. They were in constant battle during childhood of hashirama/tobirama and, talking about war... there are a lot of deaths.
Therefore many uchihas (brothers/siblings/friends) saw deaths of their loved ones and should have awakened MS during battles.
Latest chapter also shows, era of hashirama was very far from the So6P
but it was said by Tobirama, he had seen many countless times of uchihas awakening power from despair...
Tobirama is also aware of the EMS of sasuke, it only signifies that madara/izuna was not the first to awaken MS. They were in constant battle during childhood of hashirama/tobirama and, talking about war... there are a lot of deaths.
Therefore many uchihas (brothers/siblings/friends) saw deaths of their loved ones and should have awakened MS during battles.
Latest chapter also shows, era of hashirama was very far from the So6P