I am confused between Joe Smith and Ian smart

Ok, who is the running back? I though Ian smart was there running back but I am hearing that Joe smith is? And wasnt Ian smsart the one who did the amazign kick return? Like ive been hearing steff logan or joe smith are gettign traded as one of the running backs, but isnt Ian smart the running back? please help me out.

Oh nvm ian smart is the kick returner and joe smith is the main rb, ian smart is jsut a back up.