I am trying to make a similar argument on a different topic
What mutations are needed for a particular trait (e.g. wings) to arise?, but there is a snag here. There is no scientific definition of a
kind, and there needs to be or the evolution people will just say that we have already observed evolution between species and you are merely asking for the impossible.
Certainly some species are classified as separate and yet they are so closely related - we can infer it is a
kind, but there has to be some way of calibrating the kinds..