I don't understand what you mean by "good ozma songs." If it's a good song and it's written by Ozma, then it is a good Ozma song. I take your statement mean you'd like them to continue writing the same songs over and over. Why would they want to pidgeon hole themselves like that? People change over the years; they mature, have different experiences, learn more about writing music so of course they're going to sound different, and I don't think that's a bad thing.
And on topic, I don't think Daniel = Ozma. Look at all Dan's other projects. They don't sound like Ozma, but they do sound like Dan. It's a collective effort on all their parts.