Board Thread:Theories and Speculation/@comment-24120130-20150429143032/@comment-6769189-20150429215641

Orochimaru was weakened, something Sasuke made note of himself. He wasn't as strong at his time of defeat.

Deidara killed himself. Sasuke only survive because Manda took the blow from the explosion

Sasuke needed Karin to heal him during the Danzo fight

The new set of eyes is similar to 9 Tails chakra is that it boosts the users abilities without training/practice