comment.tpl.php displays node creator's name, not commenter's

I fixed this by just swapping out a simple comment.tpl.php file from another theme. I believe this is the problem, on line 11:

<?php echo t('!date by !name', array('!date' => format_date($comment->timestamp, 'medium'), '!name' => theme('username', $comment))); ?>

I understand it's a breakdown of $submitted, but it ain't workin'.