I don't see anything that Gerardi did that was so spectacular last night over what Farrell did. When a game goes 16 innings, it really puts a strain on the BP, no matter how good the pen or the managing decisions are.
As far as Gerardi still having his horses for today, do you mean Betances and Chapman? I have no idea if either are available today, but both pitched in back to back games, and if I'm not mistaken, Chapman threw quite a few pitches on Friday. I really don't think Gerardi was planning on using him at all last night.