Should I trade Hyun-Jin Ryu for Mark Trumbo?

YES. Trumbo has fantastic power and with hamiliton and pujols in front of him in a deep lineup, hes gonna see good pitches to hit. This guy can hit up to 25-30HR. Ryu is unproven; outside of Yu Darvish no Japanese/asian pitcher has really succeeded so far in the big leagues.(reason if you're wondering-in japanese leagues, the balls are smaller than they are in the US so it's easier for pitchers to do well but its harder for hitters. Thats why japanese hitters do well in MLB but not pitchers, think about it, Ichiro, kurt suzuki, matsui, aoki, etc and dice k with his bad years). Hes in an OK ballpark but hes got tough hitters to face in sandoval, posey, cargo, tulowitzski, goldshmit, pence, etc.

Darvish, samardzija, fernandez, and maybe dempster (tough al east) will carry the pitching staff. With big guys going down, trumbo is a must have.

i've seem much worst trades, but I really like Ryu. Your pitching looks like it could take the hit if you can't wait for your DL players to come back. I personally wouldn't do it, but that is just because I am so high on Ryu. Most people would probably pull the trigger if they were desperate for power.