If they really want Harris, I think you can agree to that. He had a down year last year and I am not sure he is ever going to be 'elite'. If they want Lopez, then you really have to think about it. I guess no matter what, though, Carmelo is easily the best player in the deal, so you do whatever is necessary.
If you're Denver, you just look for the best deal possible. I am a little surprised the best they can get is Favors. Teams may be just testing the waters right now, but may up the ante when it really comes down to it. Whatever happens, they can't put themselves in a situation where they get nothing...