Quick point to consider - early in the game, especially on the opening drive and on 3rd downs, the home crowd was deafening. You would not know there were any OSU fans since they were in red and the fans were cheering when you would expect a home crowd to cheer. By the time we were down 4 scores the home crowd noise disappeared and the OSU fans could clearly be heard. When I watched the recording afterwards it was the same. So there is no way there was anything close to 15000 visitors. Outside chance of approaching 10k (but this was the most I have ever seen at RU including PSU)