Your avoiding the questions Edgeworth!
Why would Nintendo leak the character to Nintendo of America? And why would Nintendo of America leak the information to tell the Mega64, a group who are obviously video gamers who's loyalties might not only be with Nintendo? If Nintendo wants to avoid leaks, why would they put valuable information into untrustworthy hands?
Seems unlikely to me.
(How did this get into my hand?)
Sakurai directly states in the Nintendo Smash Direct that he is in the Namco Bandai building in Japan.
This means the game itself is being made in Japan. Even though America is an important country, if anything leaks, it first leaks in Japan!
Where is the proof that Nintendo leaked it first in Japan!!!