I beleive the judge is on the right track here, theres no such things as an "enforcement right", they are either the copyright holder or not, that alone grants standing.
If they persist with this nonsense and it can be shown by any of those who where part of the bit torrent swarm that this company took an active part in sharing the relevant file then all of the defendants can claim the file was distibuted legally by the copyright holder thus no law has been broken.