No program in the Bowl Subdivision has bigger shoes to fill at quarterback than LSU, which must replace Heisman Trophy winner Joe Burrow after one of the great seasons in college football history. But the Tigers have a clear picture of who's next in junior Myles Brennan, who has spent three years in a reserve role as he's worked to add weight to what was once a lanky frame.
Others may need to dig a little deeper to supplant a departed starter. For many programs, spring marks the start of a months-long competition between two or even three contenders for the starting job.