If anything, the preponderance of evidence was that the ball wasn't touched by the helmet, which was the question everything was asking watching at home - but which wasn't what the refs were reviewing. The call on the field was that the Buffalo player didn't possess the ball inbounds, and the replay showed clearly that he did. It was a miscarriage to let the call stand, and if the excuse is "it might have nicked the helmet" when that wasn't what was under review, then it's more than incompetence.