We don't need him to, at all. Mata "further forward" could be anywhere across our attacking midfield, he doesn't need to be where Rooney is.
I know that. But what I mean is if we have Mata and Rooney both in the attacking midfield type positions. Then you're back to the same old problem in the central midfield behind them. My idea would be to try and drop Rooney further back so we can actually still have the supply of possession going forward to our attacking players. Sadly our central midfielders can't do that it seems, so maybe Rooney in central midfield would be the best solution until the end of the season along-side a Carrick/Fletcher.