Zach Jackson vs. Don Kaiser — Career Comparison

Don Kaiser built a career as a starting pitcher and Zach Jackson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Zach Jackson posted stronger surface numbers — ERA 2.86 and WHIP 1.394 compared to 4.15 and 1.458 for Don Kaiser. By the career numbers, Zach Jackson had the better of this cross-role comparison — though era context would sharpen the verdict.