A healthy Mikel Leshoure probably gets the largest percentage of the carries, especially if he comes back and looks as good as he did the first two weeks of training camp last year.
Jahvid Best will get plenty of touches as both a runner and receiver, much like the Lions have used him the last two years and much like the Saints use Darren Sproles.
Kevin Smith said this offseason he thinks around 10 or more carries per game would be ideal for him as a third runner.
This is the first indication of who might have the most value among these three backs. Best is still the best PPR option, but the way things are trending, LeShoure may have the value in standard leagues and seems likely to snag some goal line TDs as well.