Just watch the sideline replay. It was IMMEDIATELY out of his control as he hit the ground. IMMEDIATELY.
God**** ref talked about the "runner" having "possession", but you CANNOT count the possession in the air, the possession has to survive the contact with the ground, which it CLEARLY did not. If it HAD, then maybe, just maybe, you could talk about where to spot the ball based on the elbow, but there is NOT clear evidence that he was ever in, certainly not clear enough to overturn a call of INCOMPLETE on the field.