He is a male so he has the advantage of breeding a number of different females. The other advantage of being a male is that he can breed VERY young. He could probably breed this coming season.
You can keep your plans of breeding him to you female pastel, also a butter/lesser if you find him one too. That makes 2 females.
What I would recommend if you want to prove if he is genetic and you have the space; is to get a normal female of breeding age and weight (+1500g) and pair him up with her this coming seasson. Normal breeder females are not that expensive.![]()