According to my research, there are currently 4 undefeated corps but 2 of them haven't even completed this season yet.
-Jersey Surf & Seattle Cascades are 'undefeated' but they haven't completed either.
-Blue Devils & Holy Name Cadets are the only undefeated corps that have completed.
Cavies & Holy Name faced off and tied and don't face each other again until San Antonio.
As it happens, San Antonio is also the 1st time the 2 remaining undefeated corps BD & HNC will 1st face each other.
Cheers,
Sean