Captain Craig wrote:
If anything it's the studio going, hey lets add that up and coming guy who's a big name in our other franchise into Man of Steel somewhere.
It's the ole "Hey lets add Eddie Murphey to the next Trek" schtick from the 80's that Paramount wanted to do.
...or, closer to home, "let's turn Superman III into a Richard Pryor movie."
That being said, Cooper doesn't seem like a bad actor. If he shaves his head and plays Lex as, well, Lex, I don't see a problem. If he goes on a "star trip," and insists on playing him with a full head of hair and a personality like an overgrown frat boy, that's a problem.