Langi wasn't sitting behind some scrub. BYU would've killed to have John White on our team back then. Langi was unfortunate to be a freshman the year John White decided to run for crazy numbers. Look at Jamaal Williams. Had Alisa not gotten hurt, Jamaal wouldn't have played much and we wouldn't have known how great he could be after his freshman year either.
Not saying Langi is a sure fire stud RB. Just saying that 1 season doesn't tell the whole story.