While I agree with much of what you say I don't think it's likely that any kind of advanced SIGINT operation was what brought him down. The most important thing to have is intelligence from humans. From insiders. This is partly the problem with the intelligence agencies today. They think too much of the technology and it's possible uses. Good old fashion "spies" will always be the most powerfull way to get information if you can get someone to cooperate. This is also why it is a bit harder in countries with a lot of people willing to kill or be killed for the sake of ideas. Even so it seems that someone sold him for the money in this case. It was bound to happen sooner or later since it's not possible to be on the run without trusting at least one or a few individuals from time to time.