What's the right way to separate the Resource Server and the Authorization Server?

Question

Using spring-security-oauth2 to secure my resources against a SSO endpoint that can act as an authorization server. I\'m a bit confused when the documentation states:

Answer 1

for someone that might be interested there is as well another example for separating the authentication server and resources server found here: https://github.com/sharmaritesh/spring-angularjs-oauth2-sample