I voted Richardson.
While, if I had to put money down it would be on Jenkins... For similar reasons mentioned.
But; Richardson showed the ability to be a change of pace guy behind SJ. In fact, in some circles he was expected to take over as the starter. In 2012, he showed some sizzle.
A leg injury slowed his 2013 season... But he's the perfect change-up opposite Stacy.
Yes, I like Cunningham... But he's more like Stacy. You want a curveball to shake things up? Richardson is a different runner and I think that plays well to keeping teams off guard.