I don't mean for this to come off as rude, but no duh that Rooney is gonna perform better with better players around him. The same way that Villa performed better with Messi. The same way Villa performed better with 7 other Valencia players making world cup rosters.
Rooney scored 27 league goals in the 2011-2012 season without the players you mentioned. In fact, overall, he didn't really have much forward help at all, and his mids were an aging way over the hill Ryan Giggs and Paul Scholes, and honestly a very weak overall midfield.
I hate Manchester United. I don't like Wayne Rooney. But let's take off the sky blue glasses (or I have a feeling for some, the red and yellow). David Villa has had a better overall career than Wayne Rooney. At each of their peaks, they were at a similar, if not equal level.