Oh, almost forgot, regarding Shamar. The bonus of keeping this guy around is that he is always the target. That's great for anyone allied with him. He's kind of like Phillip was his season. Rob M. kept him around because people hated him and wanted him to go. The key is keeping some control over someone like that. Rob managed, can Shamar's allies? If they can, Shamar is good to have for a long time.
Edited to add. I forgot to mention... I love Sherri! Someone who can play well with others and not get emotionally involved by abrasive personalities is perfect Survivor material. She lets everything roll right off her back. Awesome. I think I would struggle personally with that aspect of the game, so I have a lot of respect for it.