I think the red junglefowl standard lies in the original Gallus gallus species description. You can find a sumry on Wiki. Among other things, the description includes the presence of an eclipse plumage during the period June to October. So, in an ornathological evaluation, any chicken not having an eclipse plumage is not a RJF. Indigenous Red Junglefowl are wildlife, not domestic animals, and they should be treated as such.
The original species description would not apply to Gallus gallus domesticus, the domestic chicken.. So, I concede. Call them whatever you want. But, the ornathologists came first.