One more thing about Dudley, is that assuming Harry ever sees him again, he might start to come to peace with the way his father acted in the memories he saw. As a teenager, he couldn't accept seeing his teenage father being an ass. But as an adult, hopefully he'll start to see that people (like Dudley and possibly Draco) can change.
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I made a living on time trial blowing myself off to cross the finish line at ludicrous speed. -transience