I agree so whole heartedly. I'm ignoring that ending and thinking the brother is fine but it was mistaken identity. (trying to be so vague)
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Personally I wouldn't mind if it ended like that if it were hinted more in his character, but the whole time he is portrayed as honorable and putting others before himself. If he was ever shown to, when pushed, to pick the cowardly or selfish option i wouldn't mind it but he never did. The person who expressed self doubt the most was Rose and it would make more sense if she were the one to have hid it. It felt just out of place for the character for the sake of a gritty ending.