The difference is that the Twins took just about every precaution with Liriano while the Cubs have been reckless with Prior, Wood and Zambrano. Aside from the pitch counts, I don't see any difference in the way the Twins dealt with Liriano's injury and the way the Cubs have dealt with Prior/Wood. Liriano has been watched very closely. He started out in the bullpen in his first full major league season and then went to the pen. His IP (had he not gotten hurt) would have been in line with his previous two minor league seasons (unlike, say, Prior, who added 50 innings from his rookie season to his second season). You noted the pitch counts. It's a big deal. Liriano is averaging 89.4 pitches/game. In 2003, Prior led the league in P/GS at 113.4. Wood had 109.1 in his rookie year in 1998. Z was at 106.6 P/GS in his first full season as a starter in 2003. You don't want to push young arms anywhere near a breaking point, especially in their first few seasons. The Twins were very careful bringing him back from the injury too - he was brought along slowly. The Cubs don't always seem to show this type of caution bringing back Prior and Wood (especially Wood in 1998 - what was the point of pitching him in Game 3?). You could say there wasn't as much information about pitcher abuse in 2002-03 or even 1998 as there is now. This certainly is true. There's much more information out there and the Twins aren't the only team going to such great lengths to protect their young pitchers. But Dusty still pushes Zamrbano and Hill in a wasted season.