There is only one Church... the Holy Orthodox Church. Period. Christ did not found churches. He said, "I will build My Church!" Singular, my friend, not plural. As for these exceptions that you've cited, they are just that: exceptions and as such they are anomalies. They should not be. I'm not about to second-guess why these exceptional inter-communions took place other than to say the priest exercised economia. Whether he had the right to do so remains a question. As for your conclusions (i.e. then we must conclude that none of these traditions are indeed that one true church.) I do not accept it, but you're perfectly free to do so. Of course, it doesn't mean that it is so. It simply means that you have established your own criteria and then based your conclusions upon whether these extraordinary circumstances met such. Again, if you wish to believe that pigs have wings... that's your prerogative.
Christ is risen!
James
“For God so loved the world."