Good observation.
Also, Cora used Davis to pitch the 9th in the last Chicago game with a 16-7 lead, presumably just to get some work in.
Maybe it should have been Strahm in the Chicago game, and Davis last night.
These are the kind of questions that should be asked of the manager.
Edit: Strahm actually has the better WHIP and FIP.
But your point stands that he was idle too long.