Hi,
You're confusing the ingredients with the recipie.
A killerbee contains a superpastel (ie 2 pastel genes ) and spider.
To make one however both parents needs to have a pastel gene to pass on and at least one of them also has to have a spider gene.
To summarise a killerbee is a superpastel spider but cannot be made by pairing a superpastel and a spider.
Does that make it any clearer?
dr del