Hmm, according to what I've read breeding to a white layer does a good job of scrubbing out green, but at the cost of losing intensity of blue. In fact, I wouldn't be surprised if that's what happened when my EE Teryx was made, since her egg is so light and she has white earlobes. I of course could be mistaken, after all the reality of phenotype expression (how a gene visually looks) can seemingly defy what one would think it should do.