Organizational needs are different in a steady state environment than an environment undergoing rapid change. In a stable operating environment, you can more clearly define roles and efficiently build an organization structure. You may also be able to define specific inputs and metrics (or proxy metrics, like test scores). I need a person with such and such certifications for 20 hours per week. During build and implementation phases, you need people to solve problems, shepherd through change and accelerate the transition to the next steady state. I need you to deliver this outcome. It’s a different role, and the skill/experience of team members should be different. Repurposing resources, or assuming one input metric will guarantee results across all environments, is risky.
“There are certain jobs where almost nothing you can learn about candidates before they start predicts how they’ll do once they’re hired.” –Malcolm Gladwell