All this number 10 talk is useless really. Who is City's number 10? Silva? When they are in full strength, he is often deployed on the side. And he played there more matches than in the middle.
Rooney is a forward, not a midfielder, that's the main thing. People keep assuming that number 10 is midfielder, i don't think it's right, for me, it's a role not a position and for me iconic number 10s are not the likes of Zidane or Ballack, who i think were a AMs, but forwards like Totti, Baggio, Bergkamp. I mean creative forwards, those who can equally assist a goal and score it. And in that respect Rooney is a number 10 for me. He is a forward-number 10. Now it's a manager's job to deploy him correctly. It can be done obviously, Fergie managed to fit in him, Ronaldo and Tevez somehow. I don't think Rooney is a typical CF or a number 9 if you will. I mean you even look at his delivery, the number of great assists he had this season for United and many of them in top CL games as well. You don't really see Lewandowski, Mandzukic or Higuain making these crosses.
For all his average performance for England's he did assist a goal and with a great cross, not a 2 meter pass. And that best piece of delivery England had all match. Sterling's, Welbeck's, Barkley's crosses were much worse. Also his creative passing is much better than a common CF's one. So Rooney can be and should be a "creative forward" now how would you call it, number 10 or second striker or something else is hardly matter, right? The thing tactics need to be spot on. Rooney can play on the side even, if it's a forward position, not a midfielder in 4-5-1 like he was in England's last game.
To play him just as forward in the box is an option, but i don't think it's a good one, if you play like that Rooney is robbed of his creativeness, that is actually quite good, you just need to see how many assists he has over the last two years.