Another factor was a conversation with Tennessee receiver and former Millwood quarterback Gerald Jones.
He told Oku "not to worry about what everyone else thinks.” Oku met Jones when both were students at Millwood in 2003.
Oklahoma State remains in the running because Oku likes Cowboy coaches Mike Gundy and Curtis Luper.
Oku said he would like to learn more about the school, particularly its sports broadcasting program. The Cowboys already have received an oral commitment from Tulsa Union running back Jeremy Smith.
Oku is ranked No. 40 overall on the Rivals Top 100, the No. 3 prospect in the Midlands Region on Scout.com and is on the ESPN Top 150 watch list.
He rushed 182 times for 1,628 yards (8.9 yards per carry) and 20 touchdowns last year, earning Oklahoman
All-State honors. He has 3,897 rushing yards and 45 touchdowns during his career at Carl Albert.
Oku has expressed his desire to go out of state multiple times. Mother Denise, who was a truck driver for two years and has seen the majority of the U.S., has encouraged him to do so.
"She's seen more than I have, and she knows what's best for me,” Oku said.