Shamar definitely has problems..altho I think in time w/the proper help, he could be ok. But he's not right or ready for this kind of show/game.
During some of his talks w/others, I got the feeling that he's really trying to fit into normal life but just can't yet. Obviously, from what he told them about all that he's had to deal with since leaving the military, it shows that he is not a good fit for this. I don't think he can see any value or good experience dealing with something that he perceives as silly, compared to what he has previously had to deal with.
Sherri really has a good feel for people's personality. She described Shamar perfectly and probably has a good read on most of the players.
She certainly knows how to handle Shamar and that can't be easy.