Yeah mine are not there yet looks like i just have to be patient dad was a silkie mum was either a serama or speckled pekin got eggs off a family member as i have black rocks and other hybrids have no idea lol
What I think he meant, but didn't explain very clearly, is the shape of the flat comb across the top of the beak when the bird is very young and before it grows all walnutty. So a broader base to the comb area (U) compared to a pointy base (V).
Having said all that I have no idea if it's true! I can't remember how my chickens' combs grew in. But it makes sense from my interpretation of it.