[[It is not a scientific theory because it is not predictive but it is also not a scientific scheme of classification because there is no underlying scientific theory to justify it.]]
Since when does theory play into this? Theory of what? They don’t predict? Oh really? Because the predictions about which species class will have which features is supported by the evidence- it is every bit as predictive as the phylogentic system. And Since when does a scientific fact backed by evidence need theory? KINDS has plenty of scientific evidentiary support. Sorry- your statemnt isn’t ture.
I don't think it's going too far to say that theory is the point of science. Neither classification schemes nor any other activity that aren't built around theory based are not very useful science-wise.
And Since when does a scientific fact backed by evidence need theory?
Evidence is a verified prediction. A prediction is a logical conclusion of a theory. Therefore you can't have evidence without theory.