More on theories about the disappearance of MH370

I offered two further probabilities to the official story (which itself kept changing almost daily), till they settled on the imaginative.. “it must have crashed in the deepest, furthest  part of the Southern  Indian Ocean”. The auto hijack probability to Diego Garcia would have been to the US Air Force base on the island. The technology to remotely take full control over a plane’s autopilot is US technology. That would then hardly be a communist Chinese effort. In any case, why would the Chinese hijack their own secret nano-tech defence equipment that’s already on the way to Peking?
Al is intent on having a new tracking device placed on all airliners in case the transponder gets switched off/fails and the plane somehow is then lost. MH370 must have been tracked by two military and one civilian radar. On all those radar screens, next to MH370’s “target” blip there would be a small ID box showing the plane’s call sign and height. If MH370 had switched OFF/lost it’s transponder, then the ID box would no longer appear on the radar screens. BUT, while the plane was still physically present in the sky, the radar signal from the ground radar would strike MH370 and a return “echo” would show as a blip on the screen. (When a pilot is asked by the air traffic controller to “squawk”, the pilot presses the transponder button. This causes the data box on the ground radar screen, next to the plane’s “blip” to light up). 
Thomas