Sasuke has no heart anymore. Gaara ****ing cried! For his sake! And he didn't even do anything!!! And then when he was trying to kill Danzo? HE STABBED KARIN!! WTF?! But, i read an interveiw and incase any of you guys didn't see the OVA (Naruto vs. Sasuke) i read that Sasuke knew that if him and Naruto went up against each other, they would be at the point where they would kill themselves from fighting...of course, i'm not sure about Sasuke's opinion but i like to think of it as "I don't wanna kill my best friend"