As of right now and for a while Central has been the bigger rival for Northwestern but when it comes to overall rival it's going to be Northwestern and Jackson. Northwestern and Jackson been playing each other since 1967 and during that time Jackson was black and Central was white. Central didn’t became predominantly black until 1975. Northwestern and Central have played each other back then but the rivalry wasn't as intense until now.
Technically you just need the Thursday games in by 7 which is CN/Buchholz and St Aug/Mandarin. You would have to just PM your Friday picks before the games start when the thread locks