When you breed a pastel to a normal the pastels you make are not just pastels, they are pastel + whatever genetics the normal adds to the equation.
When you breed a clown X normal the sum total of that snake is whatever both sire and dam bring to the table.
In my opinion what you are saying isn't even possible, both parents add to the out come of every baby,
so how is it even possible to say only one trait shows?
Because early pioneers in the hobby said so?
I was always taught to question everything, so that don't fly with me.
Back to my photo's, I asked if het clown is truly recessive how does it alter those yellowbellys 100% of the time.