I think the issue is he knows every win matters. Margin of error for this team is razer thin.
So far, he's riding his best and is willing to live and die with his best on the board. Before the recent hiccups, those guys had been nails. Then they were overused. I fully expect he'll try and walk that tight rope balancing act of pushing your best guys and overusing them. It's not like he has several other reliable options (although Little and Fluharty have both really stepped up).
God knows if he was being too conservative with his pen use - trying to save guys and that was costing us games - fans would be livid...
Unfortunately, it's a tough spot. That said, I LOVED Gibby and thought he managed the pen really well. Always room for improvement, but he's in a tough spot IMO.