At the time it was still possible to carry our a large scale deployment in secrecy. No satillites, no long range reconnasence aircraft such as Blackbird and the time delays of communicating any intelligence, not to mention a mind set that 'yellow men fighting yellow men' was benath notice. Operation of any intelligence network in Japan has always been difficult for Europeans with the obvious physical difrence and the Japanese attitude to Gajin. The consipary theory seems to be a flavour of this time. For some reason it seems easier to accept than 'We were short sighted arrogant, introspective, greedy and lucky to survive'. The information would have been there, just would anyone with the power to do anything have seen it, and accepted it?