Thanks so much, it is great to know more about the specifics. I really appreciate it!Crests and combs
Crests cause a deformity in the skull of the bird. The larger the crest the larger the skull deformity.
The skull deformity prevents the comb from being straight as there is less room at the base of the comb to emerge straight. Also, the larger the crest the more likely it is that the comb will not be straight, so larger combs will appear to be more affected but the skull deformity.
There are multiple genes and factors involved in crest size, but the overall take home message is indeed that a large crest will likely lead to a deformed comb. It is tough to have both a large crest and a straight comb on a single bird.
Rinda