I think the "when and what" are known. The "who, why, where and how" need a little more work. Again we are not provided with enough information to suggest wrong doing on anyone's part. So I'll not suggest that we string up the crew just yet nor is retraining necessarily required. What needs to be discovered with some urgency is how this aircraft was able to depart and why this went unreported. It suggests, but I have little evidence, that Germania's Ops. Control was not working well that day.
PM