He was mediocre until age 33 (with 1 big exception in '93). But his peak years were concentrated, they just weren't in the normal peak age. He pretty clearly peaked from 33-40 (again, with 1 exception - the bad year in 2000). Since then, he's back to mediocre. It really looks like an average player's bell-curve type career, just delayed about 7 years. I wouldn't call them concentrated, but maybe I'm using the word "peak" more loosely than you. He broke out in '93, then sucked again, then broke back out, had a bad year at 37 in 2000, then defied the odds with a renaissance from 38-40. Then he sucked again for a couple of years before putting up above average numbers in '06. I don't call that concentrated, that's several good to outstanding seasons with a few bad ones mixed in over a 13 year period. Quick bit of trivia on the side...have any other players ever appeared in an all-star game for the first time at age 40? Every other 40 year old I can think of that's made it had been there at least a few times before. Your phrasing is pretty bad. He was mediocre to bad from his debut in '86 until '93. Then he was great in '93. You can call it a breakout or whatever, but it was one great year amongst many not great ones. I wouldn't call 105 and 91 ERA+ seasons in 94/95 "sucking" - one's slightly above average, one's slightly below. The bolded sentence makes it sound like he was on a roller coaster of suck and stud for a couple years. In reality, that sentence spans a 10-year period. All of the best seasons of his career (except '93) came from '96-'03 with 1 down year in '00. 7 of a guy's 8 best years of his career come during an 8-year span and you don't call that concentrated? Using ERA+ it looks like this: '93-'03 Great Average Average Great Very good Great Great Bad Great Great Great Then average for 5 years