From the things you already knew department, John Danks' slutter is really, really good. Baseball Analysts took a look at the toughest pitches in baseball this season, and Danks came out on top in the "slider" category. I can't say that he doesn't throw a slider, but if he does it's sparingly. More accurately, Danks' cutter is the pitch they're quantifying.
+-----------------------+--------+-------------------+| Sliders | Number | Run Value per 100 |+-----------------------+--------+-------------------+| John Danks | 55 | -6.0 || Kyle Davies | 32 | -5.1 || Santiago Casilla | 34 | -4.8 || Yovani Gallardo | 29 | -4.8 || Mark Lowe | 30 | -4.6 |+-----------------------+--------+-------------------+
It's nasty, no matter what name you give it