PN
I think your question should be answered by an independent inquiry.
I like the approach taken here because it adopts the same forensic line of questioning you'd expect from such an inquiry. It "follows the lies" and asks "Who benefits?" which is a simple but effective technique.
https://sites.google.com/site/militaryairworthiness/
I particularly admire the way the strands of apparently unrelated events are brought together. It doesn't set out to answer your MRA4 question but it does point to "Who?"