While talking to YRB magazine, Kellan talked about how he got the role of Emmett. He also mentioned why he didn't try out for the role of Edward Cullen:
"I don’t think I would have played a great Edward. I think what Rob [Pattinson] does with it is mind-blowing. They need someone like Rob to really give Edward so many layers without doing much."
Read the rest and check out the gorgeous pics!