yuukiren I think it's better to phrase it that Sai is becoming more in touch with human emotion, he is human to begin with. But I am glad to see how far he has come, in the beginning I hated him but now he's awesome, and I'm glad Naruto and Sakura have begun to develop a bond with him.
It was so nice seeing this episode, like the very end of it.
The smile on Naruto's face, the smile on Yamato's, the non-existent-but-known-was-there smile on Kakashi's, and the shock on Sai's.
That was such a great moment in this anime...