If he wins immunity, or after him, I'd guess that Brenda is next on the chopping block. Andrea did open everyone's eyes that she is both an immunity & final vote threat. Everyone likes her. That makes her someone not to take to the end.
After that, it's a crapshoot.
I think Sherry has done a great job ingratiating herself into the dominating alliance, but when it comes right down to it, she's still an outsider from the other tribe. If no one else does anything stupid, like Andrea, she's the logical next boot.