I believe people are suggesting Rich Hill has been better than Z since the middle of last season. There are causes for concern for Z though - his back, his weight, his BBs. Since August 1: Rich Hill: 83.2 IP, 2.47 ERA, 84 K/21 BB, 0.91 WHIP, 11 HR Carlos Zambrano: 78 IP, 4.62 ERA, 68 K/44 BB, 1.47 WHIP, 8 HR Carlos has better stuff and has a much longer and better history but Hill obviously has been much, much better over the last half season. This may be a simplistic view on my part but, if Hill continues to consistently throw strikes along with hitting his spots and Zambrano doesn't, Hill will be the Cubs defacto ace. Until Zambrano consistently throws strikes he'll always be a level below the Chris Carpenters, Roy Oswalts, etc.