Greg Van Nada of Great Commission Ministries (
http://rivchurch.com/about/leadership/greg-van-nada ) and Tom Thomas Mauriello only give one line of explanation for the name change in the letter. GCM leadership doesn't have any real accountability from an independent, outside board.
Here is the line from the letter and is arguably the only "explanation" given in the letter:
"the missions agency in Orlando—GCM—was never strongly distinguished from the association of campus churches that helped found us."
My opinion: The association of churches that the letter is referring to
is GCM.
Personally I don't care about the name change, in-and-of-itself, just how it came about and why. Even if it was done with zero attempt to hide from its criticisms under the GCM name (which I can believe), the way the organization can quickly and almost unknowingly make huge changes without any outside accountability isn't healthy, especially for an organization that has been around as long as it has been - they really need help, but GCM is so inbred and boxed-in they struggle with getting it.