
So, according to the theory:
1. Are some things designed, or is everything designed? Is it enough to show that some features - say, eyeballs and flagella, are designed? Or does the theory state that all features are designed? If the former, then the theory is easier to prove but limited in scope. If the latter, then a single counterexample shoots it out of the water.
2. Does the theory allow for multiple designers? Not trying to be facetious here - but why only one designer? If we look at, say, paintings by Picasso and Norman Rockwell, we can pretty much tell that there were (at least) two designers. Likewise, if we compare octopus eyes and human eyes; or kangaroos and deer; or chlorophyll and hemoglobin, do we not see indications that at least two designers were vying for the commission?
What do some of the proponents of ID say?