main reason why the oracle is a different person is cause the original actress that played the oracle passed away after her scripted parts of reloaded.

on another note on the thing i said earlier. WATCH IT AGAIN. you will know what im talking about. i am gonna watch it again tonight so i can better explain it to you. it was a guy and girl in their teens dressed in these grayish robe with stripes on them in some kind of control room. maybe they were the humans controlling the machines or something. but if you watch it again you will see it.