I have raised a support ticket.
It is logical to me how I put it.

Primary WP role overrides a lot of stuff your roles will do.
If the WP roles can be blocked from being changed then your roles have more value.

A standard subscriber (user) (wp role) who I would example like to add a user or change that users password can do that with those role manager permissions listed, as role manager allows to access user settings backend. Allowing minimum access via role manager to user settings and also allows that delegated person able to make anyone a editor, admin or any other WP role. If WP can be blocked from being changed then that would help keep the backed more secure.

Via the email/support ticked I’d consider doing a mini video cast to show you if you can’t replicate it.

Thanks

Hi Syam.

More info.
If I set person A up – their account along with any account will have the primary role via wordpress as Subscriber. (The minimum permissions)

Via your role plugin, I can then create a group for managers.
If I allow the managers roles under ‘users’, tick the following:
list_users
create_users
promote_users

The person in the role can change the primary role of the user, example make them an administrator etc.
It would be good if the primary role via WP could be locked down, I can’t specifically see away to do such. With the primary WP role locked down this could then allow the roles only to be changed with the promote_users ticked under the role.

Hope that helps give some more info.
Will submit this and then send my email via PR.