Turnovers happen because either mistakes are made or defenders make great plays. No luck there. BYU scores because they drive the field last week including converting a 4th down on their side of the field. Lassiter makes a great play but there wasn't any luck involved. OSU defenders played it poorly and BYU made them pay. The Baylor game wasn't "lucky" either - BYU held them off at the end with something like three straight stops.