My mentor tells me the taller rose combs are a sign the bird is carrying the recessive gene for single comb. I'll be putting that to the test once I have another hen go broody. I am doing test breedings to single combed sex-link pullets, as the single comb gene is also a simple Mendelian inheritance. If my cockerel with the taller comb throws half single comb chicks, then that will confirm.
I can save you the time hatching and then having to cull single combed chicks. Your mentor is spot on!
Besides being a sign of recessive single comb, the taller combs also throw chicks that have a more uneven unacceptable comb. There are more sprigs, spikes, extra leaders and inverted DQs.
I had to cull heavily for two years because of monster combs, deformed combs and inverted combs.
Why purposefully breed in a flaw that you will spend years purging unless you enjoy eating a lot of chicken!