I would not trade one of the top 5 RF's in MLB to our division rivals. Greinke is very good, but he's not an ace. He's a 3.80 ERA, 1.200 WHIP, 114 ERA+ guy. You don't rebuild just because you lose Greinke. I bet Peralta can put up a 3.80 ERA, 114 ERA+ season in 2013, certainly by 2014 (if not better). I'd let Marcum walk too. Bring Wolf back for another year and put Peralta in the starting lineup for 2013 along with Estrada. You'd be looking at maybe 3 more losses over the course of a 162 game season. Seriously, check out the WAR value of these players. The difference between Marcum and Estrada is about 3 wins (based on last year's WAR, and that is betting on Marcum staying healthy!) We invested a lot of draft capital in pitching, they'll be ready to help us in 2013 and 2014