Bb being the final Villan is splendid twist.
The protagonists give their all to defeat Imu just for them to hear another boss music at the end with BB
I haven't scrutinized the Mural that much but I saw no BB.
He is that wild card that will contradicts the mural.
Ie: plot twist
The only difference is Zetsu’s changed Uchiha mural..
While Bb's existence itself changes the Mural.
The protagonists give their all to defeat Imu just for them to hear another boss music at the end with BB
I haven't scrutinized the Mural that much but I saw no BB.
He is that wild card that will contradicts the mural.
Ie: plot twist
The only difference is Zetsu’s changed Uchiha mural..
While Bb's existence itself changes the Mural.
The way Imu showed up first make me believe that BB will take over as a final villain somehow, either through the national treasure that was mentioned earlier or through other undisclosed means.
More importantly, I am curious to know BB's source of information. How and why he knows so much?