I had this thought about Itachi reactions:
why did Itachi spare sasuke?
what if he didn't spare sasuke life but saved sasuke life. Here is the deal (my opinion), The AL killed the uchiha clan because Itachi refused to join him, and told Itachi that if he didn't join him he will kill sasuke also. So Itachi saved Sasuke because he saw the potential in sasuke and that he will someday avenge and defeat the AL. He also wanted to give Sasuke and Naruto the time to grow and develop, because he think that both of them are the only hope.
This my opinion based on Itachi reaction when he heard about sasuke killing orchi, and when deidara and obito are assigned to kill sasuke. Also when he fought Naruto with his 30% clone, he said that Naruto improved alot, but he didn't say, because of that he should capture the Kyuubi fast. He also didn't share it with Kisame about Naruto improvements.
Does anyone feel the same thing, or have another opinion?