Are you the same anonymous poster from the original comment? Sorry, but your attitude towards the pairing seemed pretty different and I wanted to check. XD
I agree with both things you said, especially the tragedy of Sasuke. The only thing I disagree with is that I think Sasuke might someday feel as though Sai could be a better friend to Naruto and Sakura than him, if he has self-doubts after returning to Konoha and thinks that he caused too much pain to Naruto and Sakura for him to be good for them. Of course, we as readers know that they felt a lot more pain because they missed him than because his actions hurt them, but Sasuke hasn't been around to see that and I doubt he'd be thinking logically.
Re: Good job. . .
I agree with both things you said, especially the tragedy of Sasuke. The only thing I disagree with is that I think Sasuke might someday feel as though Sai could be a better friend to Naruto and Sakura than him, if he has self-doubts after returning to Konoha and thinks that he caused too much pain to Naruto and Sakura for him to be good for them. Of course, we as readers know that they felt a lot more pain because they missed him than because his actions hurt them, but Sasuke hasn't been around to see that and I doubt he'd be thinking logically.