May had a bad start in high A in 2010, and then figured it out in 2011. He wasn't great last year in AA, but in 2013 here's hoping the trend continues and he dominates. If this trend holds, it also means that it will still take him several years before he is pitching well at the majors. The Cain comparison looks about right from this perspective. Cain was in the majors full time for his age 21 season. Ages 21-23, he had ERA's around 4, K/BB around 2, and WHIP around 1.3. Then starting in his fourth full year and for the past four years, his ERA has been at or below 3, his K/BB near 3, and his WHIP under 1.1. Cain is only 6'3" though, not 6'5".