When Sasuke put Sakura under the genjutsu, I feel it showed an example of him thinking ahead. Albeit it didn't need to be a very cruel one, but it's still better than her dying by getting in the way of the fight. I feel that Naruto failing to realize that and not even taking action in trying to stop her showed that he thinks with one foot after another. What would have happened if they proceeded to go to the VOTE and she proceeded to follow them? She would have inevitably died and her blood would have been on both of their hands. I know this is just a small thing, but it's the little things like this that we can assume things from.