This boy hatched from my washed and refrigerated eggs incubation experiment last spring. He's the only one of the 19 chicks that had this coloring - the others were clearly part Easter Egger (muffs and beards, hens lay blue/pink/green eggs), mostly reddish coloring (a few buff and a couple white), and almost all were from green eggs (just a couple of brown eggs hatched).
I'm guessing he's also part Easter Egger. Any thoughts about other breeds that may have contributed to his look?

My understanding is that the possible breeds in the flock that provided the eggs includes Easter Egger, ISA brown, New Hampshire, and Buff Orpington, but there must be other breeds in there, too.
I like his comb - less risk of frostbite damage.
I can live with knowing just that he's part EE, but there seem to be other clues to his genetic makeup that are present, but that I can't seem to match to a breed or breed(s).