Read Thread: Survivor
Russell is too smart not to get voted out. And Sandra really has no ties. She just votes for whomever just as long as it's not her. It's how she won Survivor before. Russell is the manipulator of everyone and i think Rob is in trouble more than anyone else in that tribe. Once Russell decides you are a threat, he'll find any means to get that person off. And based on this past episode, he will be after Rob to vote him out and i don't think Rob will last too much longer.
This is what's got me really worried for Rob. Unless Sandra's game has changed (and she said at the beginning that it hadn't), then he needs to keep the upper hand to keep Sandra. If Russell has a better deal for her, she will vote for Rob in a heartbeat.