First thing to note is that Blevins is not a LOOGY. Here are those splits I promised youWhat have we seen in 2014?
v R : .220 / .314 / .322
v L : .250 / .340 / .419
v R : .219 / .333 / .310
v L : .182 / .248 / .327
v R : .190 / .267 / .314
v L : .253 / .299 / .442
See? If anything he's been better against righties over the past 3 years. The take away though is that he's been effective against both sides.
v R : .333 / .417 / .472
v L : .134 / .194 / .209
This year, Jerry Blevins is a LOOGY. What the hell, Jerry?
The high ERA (5.11 right now) isn't exactly his fault. His LOB% is pretty high and for a relief pitcher that usually means the guys coming in after you aren't doing you any favors. But even given that you can't ignore the split we are seeing this year. The OPS that he's given up to righties this year is All-Star caliber, meaning that those righties would be an All-Star. Pitching him against all but the weakest righties is a non-starter.
There's some issue with a high BABIP vs righties, but it's not just bad luck. Righties have a much higher LD rate (27.6%) than lefties (18.6%) and they've hit all the homers he's given out. His walk rate vs righties is way up. He's throwing more junk at righties this year and getting more swings and misses from righties, but they are hitting his junk harder this year when they do connect (lefties are too)
I'm just stating what I see at this point, I'm not going to suggest any deep knowledge here. Is he having trouble controlling his pitches this year? Is he pitching around righties more? Is there something psychological versus righties that is going on? What I do know is the facts are the facts and you can't use Blevins versus righties right now, unless you are talking about Lombo type hitters (at best... I might not let him face Lombo either - that's asking for a single).
The goal, down 0-1 with only one inning left, is not to minimize scoring but to eliminate it. You knew that if you brought in Blevins you'd see a decent righty (Reed Johnson : 286 / .300 / .408 vs lefties) so you can't do that. Based on how Blevins has done versus righties and the fact Johnson isn't bad you gotta think Johnson has what, a 40% chance of getting on base, most likely through a base hit? Even if he gets the next two guys you are likely bringing up Stanton one more time, runner probably in scoring position, a situation you are desperate to avoid. I know if you bring in Clippard or Storen first you'd be likely facing 3 LH hitters, but both are pretty capable of getting them out (Clip .675 OPS for lefties this year - better historically, Storen .547 OPS) and you know what? If they fail to get the first lefty out (Garret Jones .267 / .334 / .467 vs righties) then you can still switch over to Blevins if you like. Or hell you could even wait until they announced Jones and then pull Clippard or Storen and let Blevins deal with all three. The only thing you can't do with these three pitchers is let Blevins face that righty.
The game situation demanded as close to a sure out as you could get at all times. Blevins v righty batter is one of your worst match-ups. It should have never happened.