I'm going to throw another monkey wrench into the equation. Peep could be a wyandotte with an incorrect comb!
Wyandotte are supposed to have a rose comb, but some of the breeds originally used to create wyandottes (and probably some of the newer color varieties) were single combed. Since single combs are recessive, they can "hide" in a flock of rose combed birds and pop up from time to time. It's actually not uncommon for hatchery wyandottes to have a single comb instead of a rose comb.
Wyandotte are supposed to have a rose comb, but some of the breeds originally used to create wyandottes (and probably some of the newer color varieties) were single combed. Since single combs are recessive, they can "hide" in a flock of rose combed birds and pop up from time to time. It's actually not uncommon for hatchery wyandottes to have a single comb instead of a rose comb.