Firstly welcome to the community 
Why does he want axanthics?
If its the black and white, they don’t stay black and white in ball pythons as they age unlike corns for example.
I suggest he look at adult pictures of snakes on morphmarket or the forum.
Maybe he has, I dont know but for other internet readers of this discussion its a good point to make.
See what adult morphs look like and what he likes then. That’s how i picked the ones I wanted to breed.
Most ball pythons change a lot with age. Some improve colour others not.
Also blood line makes a difference.
Its best to get a morph you will still love when it changes.
Many change for the better too.
Just a thought.