Boren's statement that it is "not a sure thing."
"It appears now that Boren has come full circle on his expansion beliefs, adding another layer of uncertainty to the already muddled Big 12 expansion exploration process. Interviews with multiple sources around the Big 12 in the past week revealed a belief around the league that Boren has reversed course on his view of expansion. Boren had always been thought to favor BYU, but adding the Cougars still appears untenable because of the potential furor over their "honor code", which deems "homosexual behavior" as a violation.
Boren's public comments on Sept. 14 that expansion is "not a sure thing" are perceived around the league as the manifestation of his reversal on the issue."
http://www.campusrush.com/big-12-expansion-oklahoma-sooners-texas-longhorns-david-boren-2018459914.html