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Interesting that there are "3 major comb alleles". S on chromosome 1, D on chromosome 2, and R on chromosome 7. I've often wondered how many modifiers there are. I've seen 3 or 4 in my chickens and pictures here suggest a few more.

Pea comb as normally described has a central ridge that appears slightly notched (forming peas) and a ridge on each side that is usually lower than the central ridge. The pictured rooster has a central ridge but no ridges on the sides. Pea comb is normally a smaller comb than in the picture...

Will chime in to say that the rooster in the pics is NOT pea comb. That is a modified comb of some type where two different genes are being expressed. Look closely at a homozygous pea comb bird and note the tiny notches along the center of the comb. Then study your bird.