I'm not 100% sold that Mourinho wants Rooney anymore ... I think he's doing what he does best:
1) Unsettling a major player for Manure
2) Unsettling Moyes' first summer tenure - he's struggling to get big players in, and now has to keep Rooney away from Chelsea
3) Most likely causing discontent amongst the Manure players (Rooney's commitments, Moyes' ability to handle the job etc).