Scrum master as Agile coach

"Effective change is driven from “the inside-out”. The Scrum Master - being part of the Scrum Team - is in a better position to facilitate this change than an (external) Agile Coach. This is also how the Scrum Guide intended the role of the Scrum Master.

When organizations choose to implement an empirical process primarily through Scrum, there should be almost no need for Agile Coaches. Instead, Scrum Masters should be enabled and supported to promote the empirical process on all levels of the organisation. If they can, and if they do, no other roles are necessary to help organizations generate valuable outcomes through Scrum."- Barry Overseem

Full article by Barry Overeem here.