That's surely not the proof you want. All those kings come from one area. Its in their genotype. That area produces what it takes to survive. Its not influenced by out breeding or intergrading.
You want to call them by color and pattern. Which is wrong. Color and pattern are weak taxom characters. Particularly with polymorphic species. Oddly, you can find, blotched, banded, speckled, and striped getula from coast to coast.
What proof I ask for was genetic proof of current intergrades. The product of Two types. Not a bunch of color morphs that occur in one area. Best wishes