Arguing for the validity of creation and the fallacy of Darwinism is important and should be made until schools start teaching what’s verifiable, not myth. I think your emphasis on a minor issue of slight variances within an animal group is irrelevant, confuses things, and doesn’t help with the big, important issue here.
You're not going to validate creation and disprove the theory of evolution using claims of "hydrologic sorting" to explain the layering of the fossil record, or claiming that all the uranium samples are contaminated with exactly the right ratios of daughter elements to make the falsely appear to be billions of years old.