Ok, Shane, let's go with that. Just for the sake of argument, on the basis of what you know, would you be willing to allow a combination of a partially endothermic process (50% efficient, say), together with the jerry-built heat exchanger? Let the proposed scenario be improbable in the extreme, just not impossible, e.g., as a result of being contradicted by sympathetic testimony in the court docs.
Here I am not phrasing things along the lines of my own understanding and am just curious whether it is possible to get broad agreement on the remaining set of possibilities. Will people agree that the water main scenario can definitely be ruled out, for example?