Truth is probably somewhere in the middle. Someone probably gave him verbal permission but the written permission never existed. That's a disconnect but fault also lies with Dwayne as he pressed on without the written stuff.
If written permission existed, there is no way in hell MLS lets one of their good PR stories go to the shitter to protect the public name of Brennan or Earl Cochrane. The process wasn't done and he pressed on knowing he didn't have anything in writing.