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AT Core currently wraps a comment's creation date in a link to the comment itself. This doesn't seem semantically correct (I could be wrong on that point!) but it is also a duplication of the link that wraps the comment's title.
While not directly a problem, it can also make integration a bit more difficult for other module's (such as Timeago) or subthemes (such as Commons Origins) which try to utilize
$vars['created'] for their own purposes.