Very few burst onto the scene. The Cubs got scene bursters with Wood and Prior. But they abused the heck out of them and couldn't keep them healthy. That's one of the big problems with devoting the vast majority of your minor league system to pitching. Pitching is unreliable. And who are all these other teams with first year guys tearing it up from the outset? It just doesn't happen all that frequently. The difference is most other teams don't send a guy down for struggling and blame their struggles on the kid. The Yankees for instance have an impotent Melky out there everyday and he's as much of an OF butcher as any Cubs fielder. Just about every team has at least one. Let's look at our division for example: Elizardo Ramirez, SP, Reds Prince Fielder, 1B, Brewers Ronny Paulino, C, Pirates Anthony Reyes, SP, Cardinals Adam Wainwright, RP, Cardinals Ok, so the Astros also don't have one. I could go through the other divisions and find similar players, but I think you get my point. Murton and Cedeno came up as rookies last year and played very well. Like many before them, they have struggled at times in their second season. Most of the guys you listed will have their struggles, as well. Some of them could end this season with mediocre numbers. Anthony Reyes has thrown a total of 33.3 innings in his career. I'm not ready to name him Rookie of the Year just yet.