I dont think it was a discipline thing. From what I gather on the internet apparently they are taught that when they think the defense lined up or jumped off sides to remain still so the refs can catch it.
I have no idea why he stayed in formation even when the whistle wasn't blown.
Also, you can clearly see that they must have all thought it was offsides because the right guard doesn't move either until the defender is already behind him.
my only guess is that it was a sign of protest, just like Kiffin and Seabass' 76 yard fg.