Interesting story related to another game series about that, actually. For the the announcement trailer of rhe upcoming Darksiders 3, whose main character is a woman named Fury, the developers cast Cissy Jones (Delilah from Firewatch, Chloe's Mom from Life Is Strange) last minute as her trailer voice. Cissy wasn't told what the two lines she recorded was for, and it was later when watching E3 recaps that she saw the trailer. She had her agent call around and found they hadn't settled on a voice yet which is apparently common, so she got to request the part.
Based on Ms. Jones' interviews on the subject, that kind of thing happens more than people think. I wouldn't be surprised to find they'd cast Alyson for the role because they were unsure of Hayden's personal status.