My problem with Kinley is simple: he's a 27 year old pitcher who has yet to have a good season in AA who's taking up a roster spot. He doesn't look like a future MLB player. He's not the primary reason why the bullpen stinks and not responsible for losing any games, but there's no reason to keep him around the entire season. He'll be 28 next year and he'll still need to repeat AA. He might be 29 or 30 by the time he's "ready", already past his physical prime. He's a non-prospect at this point, so no reason to waste any more time or roster space on him.