Who should I start at RB?

SD D is going to be a lot better this year. Jackson is a possibility because of loss of key players plus 2 good receivers. Bell will get most touches but Bush is gonna get the receptions out of the backfield. I think I would go with Jackson since you already have him. Bell is also a good option but since Pierre Thomas will be back in a week I wouldn't waste the acquisition if their is a limit in your league.