DuBose is a good pitcher. He was ranked as the #2 collegiate prospect in 1997 by Baseball America, then selected by the A's in the draft. He has done very well in the minor leagues, but had a few injuries. He seems very healthy now and I'm expecting a sub 4.00 ERA, nice low WHIP under 1.25, moderate Ks, and 10-13 wins. Given the competition, you might want to have a deep enough staff that you can spot his starts a bit, but I'd definitely keep him over Alvarez.