The first turnover led straight to a scoop and score. Without that BYU could have had a 17-7 lead at half.
Then instead of throwing a pick 6 to start the second half BYU could have gone up 24-7 with an opening drive......but instead the pick 6 and the scoop and score in the first allowed Kansas to build the 21-17 lead.
Then again in the 2nd half BYU was only down 28-20 and driving when Kansas picked it off again. Instead of driving to try and tie it up Kansas gets the turnover which then they turn into another score to go up 35-20 and game is basically over.
If BYU can go turnover free they can beat KSU at home.