As SSR has pointed out, his ERA has actually been right around league average for starting pitchers. It hasn't been awful. Plus, look at his home and away ERA splits from his time with the Cubs, and his time with the Phillies: Cubs: 99 Home: 4.20, Away: 3.99 00 Home: 3.71, Away: 5.15 01 Home: 3.39, Away: 4.24 02 Home: 3.09, Away: 4.31 Phillies 05 Home: 4.38, Away: 4.05 06 Home: 5.18, Away: 4.64 07 Home: 5.26, Away: 4.19 The last 3 years in Chicago, Lieber dominated at Wrigley. His road ERA was over a point over his his home ERA each season, which is a dramatic split. As you can see, his time with the Phillies has been hurt by their very hard ballpark to pitch in with home ERA's being worse than road ERA's every year. Take him out of Philly and put him in Wrigley again? His numbers most likely improve, not regress. At worst he'll likely be a league average starter once again, which is a better guarantee than you can say for Dempster. Now, knowing that Lieber has been a ground ball pitcher when he is going good, has his GB/FB ratio taken a hit in the last few years that would make his Philly #'s out of whack since the ball jumps out of there? I seem to recall that him keeping the ball down was the reason for his success with the Cubs.