I've been thinking for some time that the man child that is Rooney has peaked.The signs of decline are already there.Blessed with a powerful physique at 16 he dominated youth football and was more than a match for the senior flight....however,his physique has always been more that of a sprinter/boxer than a footballer.He was a freak for his age at 16.
He appears now to be musclebound with a tendency to pile on the pounds particularly as he gets older.
No surprise therefore that he tends to fade often disappearing in matches because he lacks stamina.As he gets older I predict he will continue to struggle both with his weight and fitness.
Make the most of him for what remains.......he will continue to disappoint as he declines