Well, there is that once instant when just before he fought Orochimaru-in-drag-disguise, he did mentally slapped himself for not giving his all for giving team loyalty. Orochimaru then goes on saying "Oh no you didn't," and proceed to give the boy a cursed hickey, causing Sasuke to convientently forgot about team loyalty for the rest of the series.
I agree that Sasuke has some major loyalty issues, but I disagree that he's incapable of learning at least some of it in Part 1. Sasuke's main problem is that his mindset was so fucked up from both his past it made any concept of going beyond himself and his revenge would be difficult for him to comprehend. The moment he finally did understand, he got beaten up and was hammered to back to another issue that he had: not having enough strength to stop the massacre, which was one of the major reasons he left.
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timeasmymeasure
Maybe I'm confusing the anime to the manga, but . . .
I agree that Sasuke has some major loyalty issues, but I disagree that he's incapable of learning at least some of it in Part 1. Sasuke's main problem is that his mindset was so fucked up from both his past it made any concept of going beyond himself and his revenge would be difficult for him to comprehend. The moment he finally did understand, he got beaten up and was hammered to back to another issue that he had: not having enough strength to stop the massacre, which was one of the major reasons he left.