Should I accept this fantasy football trade?

All depends on the scoring system in the league. If it favors WR's then yes, if running backs no. If equal, No I would say you need Stephen Jackson because I think you are more vulnerable at RB. DeAngelo is not even on a team right now and coming off injury. Even before the injury was just performing at a subpar level. Blount is too young, Benson is alright at best, and Thomas will help you in return yards. So you need Stephen Jackson.