I think the OP's chicks are mixed breeds hatched from local eggs. The RIRs and Comets being the potential moms and the Dom, partridge Rock and Wyandotte being the potential dads.Oh sorry, I was just looking at your list, not at the photo! If I understood correctly, you wrote that the hens you ordered were RIRs and Comets, and the other breeds you ordered were roos. If that's the case, you likely have a roo, just because your chick doesn't look like an RIR or Comet. Does that make any sense?
Interesting info, keesmom! Thanks for sharing.