If Matt did try to save Salvo why would he vote for him today, especially as one of the first ones to get the bandwagon going (Lemon already on board)? I suspect Quetz of being a G, but my theory is that both Salvo and Sheik were C's and Quetz is just using Salvo as easy target, he's going to attract a lot of votes again.
My personal opinion is that Salvo is a C, because no one really tried to save him yesterday. Cuti or Fresh on the other hand might be G's.