That's all he can say cause, honestly, he wouldn't dare to talk about success, since right now she's more successful than him on both album sales and critics acclaim.
I'm a big fan of both. IMO, Amy knew what she was doing to get press. Really, she doesn't need it and we all know Kanye doesn't have the best of moments at times. I'm kind of glad he didn't say anything bad about her back, and we all know how easy that could have been.