Quote Originally Posted by Assertn
He was clenching his arm when he was talking about taking his brother's eyes.....
I think this would more likely imply that he still regrets having to do that, rather than, you know, suggesting he's Obito...
A sign of regret makes total sense. I wasn't trying to suggest that there had to be some complicated meaning when he clenched his arm...I just wanted to know what else it could mean and not ignore it.

When Kyuubi told Sasuke he had a chakra that reminded him of Uchiha Madara, it was implied that they had a past relationship...another thing disputing Kyuubi's attack as a natural disaster.