of all the backs that the Saints have had the last few years, only thomas was a low investment. They have had a lot of talent in their back field. Sproles and Bush are comparable IMO. Both great recivers out of the back field, but I've never liked either running the ball a lot.
McCoy and Charles I find comparable to each other, the opposite of the first two. Great runners, not so great recivers.
CJ we have seen excel at both. I'm excited for a healthy CJ this year.