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Chickens are very capable survivors, when they are out in the country they are in my opinion more likely to survive then in a coop where there is no escape route for them if and when the predator gets in. Its a bit like shooting fish in a barrel, Chickens are prey animals and have survival instints and the longer they are in the wild the better they get. An hrs walk isn't that far, my chickens wander around all day, and they can get in and through all kinds of terrains that we can not. There are alot more prey animals out there then predators and they seem to survive to breed otherwise they would all be extinct.
There are millions of wild cats out there just because they went missing doesnt' mean the got ate. They are very self suffient they don't need people to survive, could be out there living the life, eating small birds, mice or whatever.
Chickens don't need people to survive, we need them, thats why humans domesticated them in the first place.
I think that you believe that your chick is part sebright no matter what, We don't know what the father bird was, we don't know what the mother bird was so the possibilities are endless, short of a DNA test I don't know.