If the refs were in the tank for KC, the obvious place would have been on the fumble out of bounds in the end zone. It was close to a 50/50 and it went touch back Buffalo, and was a 7pt swing as it would have been KC 1st and goal at the 2. IIRC, the network's pet ex-official did agree with the call -- after it was made. And it was an overturn so it would have been easy to say the evidence was not clear and convincing enough.