God created the world to exemplify certain values. Someone who propounds
a design argument for the existence of God probably needs to have something
to say about these values.
Scientists often propound particular models that instantiate a more
general theory. These models are sometimes intended to be more realistic
and sometimes less, but the hope is that by studying them and by noting the
divergence, if any, between model and reality we will learn something
about the relevant phenomenon. Some realistic models will be empirically testable and others will not, and scientists of course have a preference for testable models. Thus, an evolutionary scientist might offer a
more or less realistic model of the evolution of wings. The model may well predict what kinds of fossils we will find. If the model’s predictions are not borne out, this does not in any significant way affect the probability of
evolution in general, but studying the model is helpful, and if the model’s
predictions–assuming it makes some–match observations, so much the better
for the underlying theory.