By Kyle Fredrickson Staff Writer kfredrickson@oklahoman.comSTILLWATER — Oklahoma State returns one of the nation's most dynamic offenses in the country this fall, but as spring practice begins March 6, all eyes will be on still unproven Cowboys. Here are three offensive storylines to follow as we near the beginning of the 2017 season. Backup quarterback battle For the third consecutive year, OSU fans can breathe a sigh of relief with zero questions at quarterback entering the spring.Read more on NewsOK.com