Simple Math

Casey Daigle against the Cubs:

 IP    H   R  ER  HR   BB  SO

12.3   7   3   3   0    5   6

Casey Daigle against the rest of the league:

 IP    H   R  ER  HR   BB  SO

13.0  20  16  16   6    7   6

Todd Walker in games Cubs win:

AB   R   H  2B  3B  HR  RBI  BB  SO   AVG    OBP    SLG   OPS

47  14  19   4   0   3   11  11   6  0.404  0.517  0.681 1.198

Todd Walker in games Cubs lose:

AB   R   H  2B  3B  HR  RBI  BB  SO   AV G   OBP    SLG   OPS

29   3   5   3   0   0   2    4   1  0.173  0.273  0.276 0.549

It's that simple.