Alright, I'm normally not this incoherent, but I can't figure out a better way to ask these questions on my mind.
What if Powers hadn't bailed out in time and died in the U-2 crash or committed suicide shortly after hitting the ground with the concealed poisoned needle in his possession? Also, is it possible for the SAM to do such a thorough job of destroying the U-2 that little if any evidence of the aircraft's presence survives the explosion?