I'm taking these factors into consideration.
-Current Backup(Non-Starter)
-Potential to put up the most impressive fantasy statistics if given chance
-Talent + System
-Current starter "most likely" to miss significant time
-Age of starter
=
1. Michael Turner(5'10 - 240) - Talented enough to start for any team in the NFL. Should fetch big money on the market when he hits UFA, barrring injury. Has everything a GM wants in an every-down back. Powerful legs, ability to quickly recognize and hit hole with authority, "Burner" speed and quickness. Simply put, Turner is a punishing RB that has the makeup to wear down opposing defenses. IMO, Turner's exceptional talent and solid offensive line/running system make him my choice to potentially put up better numbers than any current backup RB in the NFL. Hopefully he receives a starting gig before he begins to lose some of the ability that makes him special.
2. Mo Morris: Would run behind the best run-blocking offensive line in football. O-Line consistantly dominates opponents defensive line, opening wide holes for a running-back. Slightly above average skill set, fast straight-line runner, above average agility/elusiveness, can spot a running-lane as well as most starting RB's, on the other hand, he lacks the power of Turner or the quickness/agility of Norwood. Morris's durability is also suspect, due his small frame. Loss of Hutchinson at G could limit potential production, but whichever guard starts opposite Gray (Womack/Spencer) has the ability to perform at a high level.