Yo here is fun fact on re7 and re8,ethan fits all the traits of an immune person like being exposed to a infection or virus ake the moldand it not taking over him and you see him be killed by Jack backer and resurrects with mold powers very similar to when wesker inject himself with proto virus you needed to die to activate its power as a immune human. So ethan is immune aka superior DNA and rose is aswell because we see her die and Miranda resurrects her and guess what she has powers as a baby then.