But there was no way of knowing Ford's arm wasn't under the ball.
Whether or not Ford's arm was under the ball has nothing at all to do with whether it was a catch or not. The ball clearly touched the ground. For it to have been a catch Ford would have had to have had clear possession of the ball when that happened. Since the ball was obviously moving when it rolled over his arm and touched the ground he obviously didn't have clear possession of the ball.
If we want to argue about bad officiating decisions can we at least stick to the ones they clearly screwed up? Do we really need to pretend that something happened when it clearly didn't so that we can all feel persecuted by the mean ol' refs, again?