I just love when Darwiniacs use general claims about "numerous scientists" after I specify a scientist. Here is some specific scientists who admit Cultists don't have a scientific refutation for Behe.
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Irreducible complexity ain't about speculation. It is Darwin's own test to disprove his theory. If you don't have such a test or refuse to acknowledge such a test has failed then you stop being science based and become religion based.
Behe's claim is that a a certain construct is impossible to develop. The only needed refutation is a demonstration of a possible chain. That many exist, and we don't know how to choose among them, is just gravy on that. Your quotes that we don't have probable steps or complete understanding are irrelevant. We have multiple possibilities.
Evolutionary theory has moved beyond Darwin. Just because Darwin thought a test was valuable doesn't mean he was right. You're the one stuck on Darwin, not us.