I'm not so sure about that.
Yes he's a great ball runner. He has 320 minutes played, 1 try, 53 carries, 187m run, 2 clean breaks, 11 defenders beaten, 6 offloads. But he's also tackling at over 95% averaging 14.5 tackles a game. That's a big accurate work-rate. He's also surprisingly strong over the ball, and even when there aren't turnovers he's slowing down play (in my mind actually better than any of England's other loose forwards. What's also interesting is that his stats have been very consistent, even against Ireland in which England were well beaten. For me his stats actually read better than any other 8 in the competition - even with his virtual non-lineout game.