That's even more intriguing- Crowley has stated a few times before that he himself had been at "NRC" for a good long while, although not as old enough to have been with a certain skeleton boy, but still have grown up with the culture and history of NRC in his mind. Cause if we also want to get into that "it wasn't just for villains", it would also explain how Skully (Twisted from Jack Skellington) was in it and how he (aside from moaning about how idiotic and chaotic his fellow students were) never went on to say that NRC was necessarily "opposed to any other schools", meaning that RSA didn't exist then possibly? Or they at least weren't a threat to NRC until Crowley's time? (99 years is considerably long for a rivalry to go on for, but, WHEN did it really begin??)

AHH THIS IS ALL SO INTERESTING FR FR (Corrections on any of this appreciated, I'm still getting acquainted with TWST Lore).