I just finished rereading the BYC thread on Pumpkin Hulsey genetics and I don't see any reason that the colors of the roosters pictured would be inconsistent with the pumpkin colors seen in gamefowl. I'm under the impression that "pumpkin" is not a very well understood color.They don't appear to be pumpkins of any sort like you'd find in gamefowl.
https://www.backyardchickens.com/t/221630/pumpkin-hulsey-color-genetics
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I wondered about dun as well. And can dominant white express as mottles?They might also carry dun; I understand it is common in gamefowl.