Isn't there a relatively simple process of deduction re: the possible primary radar sighting of an aircraft over the Malacca Strait, I.e. if it wasn't MH370, then what aircraft was it? That issue is a sub-story in itself.
If it was another aircraft with a low radar sig, did it play a part in the demise of MH370, either intentionally or unintentionally? Did one plane limp off west and the other limp off east? Was it fast moving from east to west and collided with MH370?
Are the Malaysians behaving like they're under duress from another nation (China or the US) with regards to what they're comfortable saying publicly about what actually happened?
It's just another theory, but speculation will continue 'til some hard facts emerge.