Sorry, I don't see where's the edge case. In a given area there are going to be lots of planes. If there is risk of confusing them and making decisions based on non-reconciled information, it seems a pretty critical flaw.
Hard agree here. There are so many small things there that could be improved.
One simple one is identifier re-use, if it is necessary for some reason, then at the very least it shouldn't happen within a specific time frame, so that you may have the same identifier used again as in the scenario.
I agree, the described scenario could just be another day at any airport and surrounding airspace (I guess any airport that is dual purpose military and civilian).
