Alot of codoms have been bred to normal females and that can affect the look and quality of the morph. I have seen a single clutch of pastels with the alot of variation with the obvoius hotty right next to a dog. So there are alot of factors.

I pick the quality of the animal first and line is more of a reference. I have 6 different lines of pastel so its not like one dominates in my book.