I really dont think Steward has been used as a scapegoat at all, at the WC he used Smith at FB, and now he has put Furbank as first choice. This says to me simply that he wants more pace and playmaking ability at FB therefore he has found player that best fits the style SB wants us to play.
Furbank isnt the key to how we play but he fits the way we want to play, therefore Furbank over Steward.
Steward does lack abit of pace and has been found wanting in defence sometimes and doesnt have the attacking threat. His USP or solid under the highball and powerfull are just less in demand. For the record i like Steward alot and do think he is a great player worthy of being in the england squad but right now Furbank fits the style of play better so thats that.