First things first: In his (excellent) discussion of yesterday's Wade Miley/Jonathan Aro acquisitions Marc Weber of Ye Ol' USS Mariner made the following comparison:
Okay, we know who Aro *isn’t* and *won’t* be, but who does he remind you of? Vertical movement of 5″ on a slider is actually pretty rare, so we can narrow things down quickly. There’s one pitcher who throws a fastball with very similar movement and a slider that’s almost a dead ringer to Aro’s. Meet Athletics bullpen stalwart Evan Scribner.
You should read the whole thing, as it's all very much up to Marc's typical standard i.