Seriously people, with the Lord crap. Makes Sasuke sound even more lame. Emotional bitches should not be lords, and what exactly is he a lord to?
About the topic itself, a lot has changed since they have met after the Danzo fight. Sasuke got to talk to his brother, and figures out Tobi played a part in the Uchiha massacre. In the Danzo fight that is when Sasuke was at his most revengeful, it's shown through that "scary/possessed" look he has, similar to Obito after goes Gedo berserk on Mist ninja and Karin saying his whole character has changed.
Noticed when he was around Itachi he wasn't a crazed, mindless, revengeful, killing machine? And after the Kabuto fight he is very calm, possibly confused, and actually uses his head to think and sort everything out by himself, not listen to array of manipulators like Orochimaru and Obito.