The pen is totally unreliable at the moment and last night proved that Gibbons is afraid of it too. The 7th inning with Estrada was prime BP time for Gibby, and I think it's pretty obvious the reason he didn't make the call was because none of his non-Osuna RPs have reliably been able to come in and just make a decisive out.
I agree about the roster setup, but my real point is that no amount of smart roster construction can make up for Edwin, Tulo, Cola, and Martin having back-to-back-to-back terrible ABs so frequently. It's a lull that has to pass and can't really be regularly bandaged over.