Blanco and Appenzeller are our two best pitchers right now, followed not too far behind by Arvidson. Mack has elite stuff, he just needs to trust it (I have confidence that he will moving forward and take a step up as a result).
Not gonna lie, I'm a little concerned about Tegan; first time through the order, he absolutely dominates.... but come the 2nd/3rd turn through order, it's been lift off as the batters start to make adjustments.