Who would be surprised? We pretty much all suspected that Itachi also has a MS jutsu called Susano.
Originally Posted by Purple Filth
So if he goes all "Here is my ultimate technique......SUSANO" after his Ameratsu has little to no effect on Sasuke, pretty much nobody will be like "wft....I didn't see that one coming".
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"