Let's face it: no matter where OSC is in the set, people are going to blow the fuck up. Opens, middle of the set, closer, whatever. Bleed It Out is probably the most "friendly" song to close out with (it was huge back in the day), while OSC is the most intense, with Faint trailing not too far off behind. I feel like with a good extended outro, even Rebellion could be a good set closer. Maybe ALITS, but that would serve better as an opener.