Oro said the Earth Seal is = to teh Heaven seal. Also Sasuke won't be stronger than KImmamaro, well now that he is dead he will but if the seals are equal as both Kabuto and Oro explained then Sasuke won't be nearly as strong. Kimi without a curse seal was a lot stronger than Sasuke without one.

Sasuke proably doesn't even know where to find Itachi, the only way is to stick to Naruto, but either way he is going to Oro for more power the lvl. 2 isn't enough or else he would be going back to the Leaf. SO due to a flash back that is jsut nothing but a flashback he suddenly turns around and goes back?