Another thing that does happen is some people purposely breed in a different breed into their CLB's to make lighter roosters for show. While this might get them a ribbon from an unsuspecting judge, it does tend to dilute the CLB in my humble opinion. As a buyer of chicks or eggs you are not going to know this has happened.
Which crosses do you think people are making?
How many generations do you think it would take for them to breed back to something that satisfies the SOP and/or makes a convincing Cream Legbar?