League/park factors and sample size, my friend. Milone has an career ERA- of 103 (100 is average, lower is better). Not bad, but in only 490 IP and trending worse every year of his career (94 - 107 - 112 the past three years). Santana is 101 in almost 4 times the innings. Hughes is 104 with double the innings and trending better. If you want to get into peripherals and FIP-, Milone is easily the worst of the bunch at 108 and has gotten significantly worse in this mark every year (all the way to 126 last year, which would equate to about Kevin Correia's near 5.00 ERA last year). Now, as I've said before, I don't advocate cutting Milone or anything drastic, I am just not going to hold a rotation spot open for him at this point.