Re: women at the company make 99.7 cents
you cared enough about the Google pay policy to speculate reasons for the diffrences in pay
Caring enough to point out where the usual suspects are massively missing the point does not equate to caring specifically about Googles pay policy. I don't even massively care about my own employers - My salary is my business not anyone elses.
Doing a comparable role != doing the same job. There's simply too many other variables. You'd probably find a greater difference in salary between men named bob and men named bill, but that isn't really relevant any more than slicing by gender alone is.