Right, sorry, I don't think I worded that well.
I didn't mean "If Big Ten teams have perma-rivals, do they have 3 perma-rivals like the SEC does?"
I meant "If Big Ten teams have perma-rivals, do they all have the same number of perma-rivals as each other Big Ten team, similar to how all SEC teams have exactly 3 perma-rivals?" As in, do all Big Ten teams have 2, or 3, or 4, etc. perma-rivals? Or do some Big Ten teams have 3 perma-rivals and some might only have 2?