I don't know if you've seen it, but someone has actually overlapped Ashe and Widow's faces from their relative cinematics, and the structures/similarities are made quite apparent. I think the other problem people have is that, for being in her later 30s, Ashe looks nothing like her age. I think another problem is that there was concept art for her being a black woman, too.

Overlays are literally garbage for comparisons. Because they trick you into thinking two things are more similar then they are. To do an objective comparison you need to put them side by side (which is what I did for that post).

Not to mention, I’ve seen that overlay and half the face is blocked off in it (by the sidebar) which would already discount it even if it was right.