His career xFIP is *slightly* misleading because of his 2013 season. xFIP kinda breaks when a pitcher is really bad (or sometimes really good). You often see a 6+ ERA pitcher sport an xFIP of 4.5-5.0 and I think it's because the metric doesn't factor in that bad pitchers absolutely get drilled when contact is made. But your overall point is spot-on. According to xFIP, Gibson was a bit unlucky last season and he's quite lucky this season. I can't fully explain this season's discrepancy (though I'll kinda meander my way to a point) but last season's "unlucky" status was almost surely due to Gibson's Jekyll & Hyde routine. Again, I think xFIP breaks when a pitcher is really bad. We've seen it time and time again with the likes of Blackburn, Pelfrey, Worley, etc. Their ERA is terrible while their xFIP is merely bad. Gibson ended 2014 with a 4.47 ERA, 88 ERA+. Slightly below average but not alarmingly so... but when you dig into his game log, it tells a very different story. Gibson made 31 starts in 2014. Gibson gave up 5 ER or more in ten (!) of those starts. Gibson gave up 1 ER or less in 13 (!) of those starts. In 75% of his 2014 starts, Kyle Gibson was either stellar or horrible, bad, awful. That's kinda crazy but when talking about a young pitcher, it's very promising and indicates a pitcher that will turn into a very nice piece once he establishes himself a bit (as he has this season). Will he continue to be this good? I'm not convinced of that but he should be above average.