Inb4 IGN hate, what do you think of his reasoning?
If you don't want to watch, he basically turned it down because it wasn't a big enough role and he pleaded with Tarantino to have the character (Django) do more.
It's funny because he did After Earth instead.
EDIT: Shit I only just saw the date on the video, lol. So yeah this is old. No need to hate >.>
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The real reason why none of them got the Man of Steel role was because Cavill had a duty, and he wouldn't prevent [i]anyone[/i] from carrying it out.