Because he was. He still won the fight so what does it really matter?
Because he dropped like a sack of taters.
nope, he was propped up on his elbow. KOd people don't do that.
He was so out of it that neither he, the referee, his corner nor a ringside physician took him out of the fight.
he had time for 1 or 2 punches, might have made the difference. Seemed like he was trying to do a Mark Hunt style walkoff KOHe probably wouldn't have survived if Silva followed up (not that it mattered much because time expired).