Interesting mention of Rooney's different roles there by Neville, where he mentioned that Rooney was played as a striker getting maybe 20 touches on the ball per game and is now played deeper getting 100 touches per game.
By far our best run of games since SAF left was that streak against Spurs, Liverpool, Villa and City in the 14/15 season. Rooney played as the sole striker in all four of those games, pushing the back line and not getting involved as much in the build-up. Our team actually looked like a collective unit, shutting out the opposition and creating goals.
Falcao was played as a striker in the next game, against Chelsea, while Rooney was pushed deeper. We lost that game and the two games after that.
It might be a coincidence, but not involving Rooney as much definitely wasn't a hindrance on the team.