Wait a minute. There were two masked men and since one of them is Fukurou, who is other one? Is it his brother or something because both of them have no pupils.
And look back, one of the developers, Fujitsubo, was the one who told his staff to bring in the crate where Fukurou and the other person was hidden. He also said that it was God (Arata) who told him to do that. So is Fukurou on Arata side then? Or is he tricking Arata to get in the developers HQ?
Edit: Just realise the other masked men could just be Referee Nowa Jr. But Nowa Jr must be his very "exclusive" referee since he was dressed exactly the same as Fukurou. I know Fukurou have been a Kakerou member for a long time so they may have a strong bond but isn't dressing the same clothes stretching the limit of what a referee can do? (Assuming Nowa Jr did it to somehow help Fukurou's plan)