I really don't understand your reasoning. is it because you feel like America would be copying off of Japan or something? you don't want Bethesda to be a copycat? there's no reason western RPGs and really super-hard "bosses" should be mutually exclusive.
I just thought it was something you overlooked. They are both "Radiant" so it is easy to mix up.
Radiant AI was in Oblivion, it's nothing new (but it's updated i think/hope for skyrim)