Quote Originally Posted by Idealistic
Susanoo a taijutsu skill eh.... Itachi's going to use it and it's going to give him some incredible burst of speed and he's going to dodge Sasuke's "undodgable" attack. It's going to strain his eye more and take a bigger toll on his body instead of using chakra or something. Probably why he doesn't use it. I want to say similar to how Lee opens his gates.

Or maybe, he's been using it all along, which is why he can do hand seals so fast? A weaker state of it. Has that ever been explained besides "Itachi is a genius" or whatever. I mean, who else can make seals as fast as Itachi? Unless the anime just exaggerated it.

Just throwing some theories out there.
Kakashi, Oro, Jiraiya and Sasuke can all make seals comparable to Itachi's speed. I really think Susanoo being a taijutsu attack is really dumb I don't even have any idea how that would work. Tsukiyomi and Amaterasu were the most powerful genjutsu and ninjutsu respectively and they were both dojutsu but how the hell could a taijutsu attack ever be a doujutsu. However claiming that those two dojutsus are the most powerful genjutsu and ninjutsu doesn't leave room for a more powerful attack unless its taijutsu but the most powerful attack of MS(a dojutsu) being taijutsu is just implausible. Also if the most powerful attack of the Uchiha clan is a taijutsu then, Rock Lee FTW.