I am by no means experienced breeder, however I have noticed with this years batch of youngins the different comb shapes that have resulted when out crossing a single male over 4 non related to each other females with vastly different combs. One of my females has a comb that looks like a mixture of single comb and rose comb, her male offspring tend to have a much bulkier comb which is not desired. She will not be used again for breeding. Another of the hens has a very small, almost flat comb (daughter of hen pictured), her male offspring have combs identical to the sire which is very close to the ideal (he has other faults but his comb is very nice).
Here is the picture of a hen with an ok comb shape imo (the grandma of this yrs smaller combed males). Any larger than this might mean problems for male offspring.

Here is the picture of a hen with an ok comb shape imo (the grandma of this yrs smaller combed males). Any larger than this might mean problems for male offspring.