Dont try to play it smart dude....i compare them with ''normal'' make up...and im sorry
C.Theron is ugly and paranoid in that movie....Sigourney wasnt so ugly and...she had a natural badass face/look.
Compare them based on their ''normal'' looks....i dont think that if she takes the role she is going to use make up and effects so to look like in Monster again dude.
If they have to ''change'' her face like they did in ''Monster'' with
EXTREME make up then hundreds of actresses can get the role.......so why not to replace Theron with Jenna Jameson hahahahahahaha!
With such a face transformation Jenna can look ''badass' crazy or paranoid too!!!
compare them without extreme make up dude without such a big face transformation. 4 example:Juliette_Lewis,Linda Hamilton,Kate Beckinsale,Kristanna Loken,Katee Sackhoff ...are some examples of actresses that with their natural look are 10 times more badass than Charlise Theron man.
Im not saying these have to take the role...im sure i forget many other who fit too but i think you get my point.