This is a PSA, Google is going to be upgrading all the managed access levels, i.e. "Managed-Read only" and "Managed-Standard" access levels in AdWords to "Administrative" access level on November 14, 2016.
That means those folks will be able to add/edit/delete other people's rights within AdWords.
Starting on November 14th, 2016, “Managed-Read only” and “Managed-Standard” access users will be upgraded to “Administrative” access level to make it easier for you to control access to your AdWords accounts. “Administrative” access users will be able to invite new users and change user access levels for the same AdWords account.
Review users in your accounts with "Managed-Read only" or "Managed-Standard" access before November 14, 2016 to confirm that this upgrade will meet your business needs. Learn more: https://goo.gl/jdP0bw
Here is the help document on this.