The scenario would have to be as follows: Someone was conducting a military exercise with a drone, flying it in airspace full of commercial and private aircraft. The drone would have to hit the airplane, just as a missile was launched, again right smack in the middle of airspace full of commercial and private air traffic, which honed in on the drone, hitting it at almost the same time as the drone impacted the doomed aircraft.
It sounds like a stretch. I still think some missile brought the aircraft down, but the above scenario sounds almost as statistically unlikely as the meteorite theory.
I have no idea of the significance of drone wreckage being found or how it relates to explosives.
I do know that just recently, for the first time we learned that rocket could be fired from drone and that they were used in Afghanistan.
Maybe some variant of the same thing was used or maybe we will never know what it means.