I think the one thing that the OP didn't see is that in camera exposure only influence the negative density. With a certain density on the negative one can render it as light or as dark as he/she wants when making a print. If I were to print some one negative then regardless of the density of the person skin tones I would try to make it look as close to real skin tone as possible on the print that is to lighten up underexposed neg and print it darker on the overexposed negative.