I have to agree with Hunter here. The Big 10 does NOT want the SEC to be right up in the middle of Big 10 country and the only way to pro-actively keep that from happening is to let Missouri know that they are in when the B10 expands in a few years. Without that assurance, Missouri will jump at an SEC invite. I think Missouri would rather be in the Big 10 for culteral and academic reasons but without giving them something they simply can't afford to not take an SEC invite.
I think if TX or OK wanted to court the sec, they would listen. Mizzu just doesnt have it. I agree that if someone, be it sec or B12 pulls the trigger, the B10 has a plan in place. I think the next time we get all shaken up is when my Irish buddies join the party. (I like how the espn bloggers include ND in there blog already). If that happens TX will go solo and everyone else will scramble. Mizzu might end up in the B10 then, but only as an after thought. If all that goes down we will want OK as well and like I said earlier if Mizzu really wants in before that, they will have to do well this year and get OK to come with.