How the biblical kinds diversified into the species we see today is a pressing research puzzle in the young-earth model of origins. My analysis specifically evaluates Randy Guliuzza's two central claims with respect to this question: (1) that natural selection does not exist; (2) that "programmed filling" is superior to natural selection on biblical and scientific grounds. I show that Guliuzza fails to provide scientific or biblical justification for these assertions. Therefore, Guliuzza's claims represent speculation misstated as scientific fact, and the role of natural selection post-Creation and post-Flood remains an open question.