I do think we're underestimating the power of Curry/Watson, Beirne obviously performs very well as a 6 because he's mobile strong and good over the ball if we go that way.
Simmonds is a powerful little pocket rocket too, i'm not saying he will 100% succeed as this is a step up, but if you can get him any sort of front foot ball, and that is possible with a quick game (if you keep it accurate in a way England couldnt in WC final)
One measure would be to look at how NZ play, a very up tempo game, and that will always produce chances if accurate. I hope the players are given freedom to play off the cuff offloading rugby but we'll see if they can develop enough bonds to run the support lines and get timings etc
There's more than one way to get front foot ball, but I would also say it's a big reason why I'd take Tuilagi, because with him, its near guaranteed, and he creates so much space
If they can get front foot ball with a Back 3 of Hogg, LRZ and Watson however, they could be genuinely lethal, and a back 3 as Im a big advocate for... well if you can get the high tempo, it would be a cracking game to watch