Dave Koslo vs. John Mackinson — Career Comparison

Dave Koslo built a career as a starting pitcher and John Mackinson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Dave Koslo posted stronger surface numbers — ERA 3.68 and WHIP 1.342 compared to 7.36 and 1.773 for John Mackinson. By the career numbers, Dave Koslo had the better of this cross-role comparison — though era context would sharpen the verdict.