Wait one minute, Barry Sanders was great until he was 30, and would have been great for more years had he not retired. A back such as CJ and Barry can last because they manage not to take as many hard hits as other RB's. CJ has atleast 3-4 years left in him..I could definitely see us taking a big bruiser back(once Harper proves himself unworthy of that title) with a mid round pick. That would help expand CJ's lifespan in the NFL, and it would help our offense do even more damage to opposing defenses. Also, you forgot to mention interior O-line.