The Cubs could have chosen to skip Tyler Chatwood this time through the rotation; on normal four days’ rest his turn would have come up today, the off day, and the Cubs could have gone with Kyle Hendricks, Jon Lester and Jose Quintana (not necessarily in that order) against the Padres.
But they chose not to, they chose to give Chatwood yet another chance to work things out and prove that he’s worth retaining in the big-league rotation.
Maybe this is the last chance, maybe there’s something physically wrong with him, maybe it’s just mechanics that can’t be fixed.