This is such a diabolical mind-game that it never occurred to me. Like, they would all die, why would he want to incriminate someone else? But yet, people are weird and crazy. And maybe he didn't go down as a killer and decided to incriminate the other pilot? Anyway, it is totally possible to have happen. Sadly there are no cameras the cockpit, and a camera in the cockpit would really have help to find who did what.