Here's my argument: Every time you send a pitcher out there for an inning, it's a calculated risk. Every inning. Z was rolling exceedingly efficiently through 6 innings, and the Cubs had a comfortable cushion. Why blow an additional reliever inning in this situation when you have (A) Lilly going tomorrow, when he's struggled mightily, (B) Hill going Friday, who has also struggled mightily, © Marquis going Saturday, who has once again struggled mightily, and a total of 8 games in 8 days in early April when 3/5 of the rotation hasn't been able to throw 5 innings, let alone 7. At 80-some pitches through 6, I would think it's less of a risk to let a cruising Z go one more inning when he's been averaging 14 pitches an inning than it would be to burn a reliever specifically for the sake of extra rest for the only durable starter the Cubs have.