Mike Cosgrove vs. John Johnstone — Career Comparison

The numbers give John Johnstone a clear advantage over Mike Cosgrove across the core pitching metrics. John Johnstone led in walk avoidance (BB%+ 147 vs 79), run prevention (ERA+ 127 vs 98), and strikeout rate (K%+ 109 vs 83). Mike Cosgrove held the edge in home run suppression (HR9+ 216 vs 82). John Johnstone was the better reliever — the numbers make that case clearly.