As for Gonzalez, since coming to the AL he's certainly been knocked down a beg going 3-5 with just 2 saves and a 4.27 ERA in 85 appearances for the O's. Prior to his move to the AL, Gonzalez had an impressive 2.57 ERA 302 appearances for the Pirates and Braves. Clearly age is either catching up with the left-hander, or he's a pitcher better suited to face lineups where pitchers hit.
He was pretty good against lefties in 2011, holding them to a triple-slash of .214/.264/.311, so maybe there's some value there. Not sure the move is necessary, but as I've said a thousand times, extra pitching is always a good thing.