Tuilagi's best trait is his ability to break tackles and beat defenders. Those opportunities won't come as often at 12. If Jones can make him into Nonu, then that's okay. But it seems like making a player change their game to grow into someone else's shadow (an all-time great, at that) rather than make it on their own two feet with their own strengths, is the wrong way to go about things. Tuilagi doesn't have anywhere near the same all-round skill set of Nonu, he's more alike to Roberts. And I've always felt that Roberts would benefit more from moving to 13 than Tuilagi to 12...
I'm not entirely dismissing the idea of Tuilagi as a 12 though. He could be great, and it's definitely worth the risk given our lack of options. But it's really not as clear cut that it would be a good move for Tuilagi as Jones makes it seem, and I would like us to have a back-up option of recalling him as a 13, with Slade or Hill at 12, if things go wrong.
As for Jones wanting a particular kind of 12, I've always felt the best coaches are able to adapt their tactics to suit their players, rather than adapting their players to meet their tactics. We don't have Nonu, we have Tuilagi. I hope Jones realises that.
Yeah, I have a lot of time for the idea of Slade as the long-term 10.