Ryan's velocity dipped quite a bit at the end of the 6th compared to the rest of the game. If you are assuming that he would give you another full inning, while throwing 87 mph fastballs, then I don't know what to tell you. I would argue that keeping in a tired pitcher is more stupid than not at that point.
Lopez is a good pitcher, and Eloy got him for a homerun on a pitch 8 inches inside. Sometimes you just tip your cap.
And, lastly, just because bringing in a reliever in a specific spot didn't work in this specific game DOES NOT MEAN that doing something different would yield a different result.