http://www.cbssports.com/nfl/draft/...a-look-back-at-why-case-keenum-went-undrafted A look back at why Case Keenum went undrafted By Dane Brugler | NFLDraftScout.com Senior Analyst October 18, 2013 12:08 am ET Sunday won't merely be Case Keenum's first start of his NFL career, it also will be the first game of his pro career. After going undrafted in 2012 and spending all of last season on the Houston Texans practice squad, Keenum is getting a chance with Matt Schaub out injured. An Abilene, Texas, native, Keenum left the University of Houston as the NCAA's all-time leader in passing yardage (19,217) touchdowns (155). But due to his lack of ideal physical tools, Keenum didn't hear his name called in the NFL Draft and has yet to be active for a NFL game. That will change on Sunday as Keenum's first NFL start comes against the Kansas City Chiefs in one of the more hostile venues in the league for a visiting team -- Arrowhead Stadium. Why did Keenum go undrafted? Below average size (6-1, 208), average-at-best arm strength and limited mobility to do much with his legs. His ball appears to flutter, especially when he doesn't have a chance to wind up and step into his throws. Keenum holds several NCAA passing records, but those numbers came in an offense that inflated his statistics and allowed him to take advantage of a quick passing attack where he didn't need to make extensive pocket reads. He wasn't asked to consistently make NFL throws as the Cougars quarterback and at the end of the day, his lack of ideal physical tools were enough for teams to pass.