it's got alot more to do with injury than being at a better club tbh.
some players are never the same after breaking their metatarsal. Beckham being the obvious example.
Rooney's first season at Utd was phenomenal. It's since his most recent foot break that he's appeared to be less combative.
He's still the best english footballer in our lifetime and one of the top 3 players in the prem this season.
The article is a big bag of shite when all said and done.