When a company thinks about transformation or a change from legacy traditional software development models to Agile, they first think of bringing in External coaches or Scrum experts. In another situation when the companies want to increase their maturity in agile, they still will want to hire people from outside who are experts in this arena. This discussion is all about how we could groom people internally to sustain and increase the credentials within the organization rather than preferring external coaches.
Agile clinic is an approach that talks on the similar lines.