I was ahead of my time. As others have pointed out Tre's weakness is tackling and that may be ultimately what keeps him at CB. One reason I suggested the move was Johnson was playing terribly at safety. The other reason I suggested it was at the time Jackson, Elam, and Benford were holding their own at CB. Since then Elam is in the doghouse for unknown reasons, Benford is hurt, and well Jackson has been up and down.
I don't know what to do now. There are no great options. I'd probably rest Poyer this Sunday and take my chances with Marlowe, Johnson, and some PS guy at safety for the Patriots game. Then hope Poyer is rested, partially healed up, and go with Poyer/Marlowe in the playoffs.