It makes sense. From the previews, it's a water challenge, which Koror can certainly dominate and win. So if the winning tribe gets to pick a boot from the other tribe, I think Angie would be their choice. She's proved to be just as strong in the challenges as the men on her tribe, and she's sort of been "in your face" when she does win.
As much as Caryn annoys me (and a few people on her tribe), I think they'll go with the weaker Willard. He is of absolutely no use in the challenges and we haven't really seen him do much around camp. Maybe they're just not showing it, but I have a feeling he's a goner.