I see three serious problems with this argument. First, the premise doesn't quite hold up. In the first four of the eight seasons you're talking about, Garza's xFIP was considerably higher than 4.00. His good stretch was the next four years, 2011-2014. His xFIP was under 4.00 for all those seasons, though it rose each year during that span. Garza looks like a typical guy who took some time adjusting and then hit a peak. He pitched well for a while there, but it's not a steady or unified story. Second, writing off a player's past two years as outliers based on a few weeks of contrary evidence seems unduly aggressive to me. Two years is a lot of information, and the two most recent years generally provide a lot more relevant information than the earlier ones. This relates to . . . Third, aging is bad for baseball players. Expecting a player at 33 to be the player he was at 27-30, when he wasn't that guy at 31-32, doesn't make much sense, other things equal. Garza was never a world-beater. We should expect him to be in a major decline at 33. I don't know what to make of Garza right now. I've been saying he's bad for years, but he sure isn't pitching badly right now. The peripherals, to the extent the samples are large enough to matter, point in different directions. His BABIP is really low, .279, and his HR/FB is a bit lower than it's been for him in most recent seasons. He isn't striking out a lot of guys. OTOH, he isn't walking anybody, and his groundball rate is way down from last year (though it was around the same when he stunk in 2015). Players make adjustments. Maybe Garza has made the adjustments he needs. If I had to bet, I'd bet on a pretty strong regression, based on 2015-2016, the aging curve, and his BABIP and K rate. But I'd love it if he's figured out a sustainable way to match his peak performance.