It comes down to Stewart, Murray, or Lynch. Since this is PPR, I'm eliminating Lynch because of his lack of catches (I think last year represents his absolute ceiling, even though I think he can get close). Murray has the injury concerns. Stewart, even though he is in a RBBC, he was still #20 in PPR scoring last year, and I don't see him producing under that level, even in Carolina with Deangelo, Newton, and Tolbert around. I see him taking over the starting role this year with an uptick in carries. Either he will be out of Carolina next year, or Deangelo will be gone. Either way, I see him as a top 20 option this season, and the sky is the limit next year and beyond for the next 3-4 years.
CJ Spiller was really the only guy outside of Stewart, Murray, or Lynch that I would give much thought to.