Just two questions, Has Naruto really resigned himself from his love to Sakura? Does Sakura act like a "big sister" to Naruto? or are they an excuse against NaruSaku?
In a way, I don't feel like Naruto deserves to resign himself over Sakura when he won't be upfront with her. While inwardly he may have resigned himself (shown by his inability to handle too much concern from Sakura), his resignation stems from his own misconceptions of Sakuras feelings. I've always thought this misconception is from his own feelings and how strong they are towards her. I think he might expect Sakura's feelings for Sasuke to be of the same magnitude of his own for her. Thus when he sees her loving Sasuke he feels he has no chance with her because he loves her so unconditionally. At his point however, it is quite obvious that Sakura's feelings for Sakura cannot be on the same level as his feelings, especially when she was ready to give up on Sasuke's redemption.
Oh, and Sakura doesn't act like a big sister XD She is just bossy.
^ There is a reason for this though, Grave. During the development of the first anime, Hiromu Arakawa (FMA's mangaka) allowed the anime staff to work independently from her, and actually requested having a different ending from the one in the manga. She said that she would not like to repeat the same ending in both media, as well as to make the manga longer to work more in the development of the characters. The difference here is that Arakawa helped the Bones staff in the making of the series, she was their consultor. And look what happened, the 1st series and it's movie counterpart, while different, were a success, and many FMA fans are torn between the 1st series and Brotherhood, which followed the manga storyline more closely.
That isn't the case with Kishi and SP.
It's unfortunate. I'm not sure how Kishi can stand to be so separate from the anime itself. You give a great example of how aiding an anime team can be so beneficial and makes the story so much more enjoyable. I've always liked how even Kubo aids the anime team with character conceptions for filler arcs. All in all, it makes the un-canon material so much more interesting and more easily stomached when you have a part of the mangaka tied to it.