I would argue that divisional splits and a CCG will diminish the OSU-UM rivalry somewhat, and that OSU & UM must be in the same division in order to minimize that diminishment. You say the CCG didn't diminish the OU-UTx rivalry? Of course it didn't, because OU and UT weren't even in the same conference before that. Putting two teams in the same conference with a CCG couldn't possibly diminish their "rivalry" relative to what it was previously when they were in different conferences altogether. If anything, it enhances it. But that's not the situation OSU and UM are in. They've been in the same conference for 100 years (give or take), and for much of that time, their game was the de facto conference championship game. Merely adding a CCG is going to diminish the rivalry somewhat - but in my opinion it's worth it, since it involves adding another national name program to the mix in UNL. But it is absolutely imperative that OSU and UM be in the same competition pool, i.e. in the same division. That way, their game can at least be for the right to go to the CCG. Put them in different divisions, and it becomes just a rivalry for rivalry's sake. Whatever cross-divisional rivalries the SEC has (Alabama-Tennessee? Please.) don't compare, nor did OU-UTx ever compare, especially when they were in different conferences. Nor, in my opinion, would OU-UNL have held its full significance, even if the BigXII had implemented a cross-divisional protected game between the two. Still a good game, but not the same thing - it would still have been second fiddle to OU-UTx.