Obito :|
Shin is like 13 and he awakened it.
Just like Super Sayian which Gohan activated super young, then even younger Goten.
Thats what i thought about the bijuu too untill kurama ot negged by a simple 3 tomoe in the past by both madara and obitoMS has been given out far too often.
We were supposed to fear Itachi beyond belief in part I because he awakened some ancient and unseen ability that rivaled all, and now there are dozens of them.
Itachi awakaned it in 13,Obito/Kakashi in 14 and Sasuke in 16 :|
wait itachi awakened his ms at 13? wasnt it after shisui died?