User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-25192100-20140908182425/@comment-4009941-20140909010917

You say that but Capcom even stated in a book they amde that 3rd gen Rathalos is just a subspecies of original Rathalos meaning that was not a retcon.

Same can go for the Diablos. Meaning that kutku could just be a subspecies also.