Hi Perry,
Every assumption provides a basis for claim making. But, both the assumption and the claims are not testable, repeatable science when it comes to examining history. History is unique in this regard. Therefore, historical assumptions are not science in the commonly understood definition of the term as in Scientific Method. It is deceptive to use "science" in conjunction with theories, assumptions and postulates when this is the common understanding.
You have an incorrect understanding of how science works. Science comes up with theories, claims and laws to define a working model of the world around us. It's the best model that it can come up with using the data and tools available. Every single part of that model can change, even the laws, if new data or new tools become available. It's not perfect and some parts of the model are decidedly "fudgy" (Dark Matter, for example in my opinion), but the model works. And when something doesn't work, the model is changed.
The creation model does not work this way. In your example it is fitting the reality of the diversity of life into the Kinds model, because that's what the bible says. The creation model can never change because it starts from the assertions of an allegedly infallible book, so it doesn't matter WHAT THE EVIDENCE IS, the creation model cannot and will not change.