I really do doubt Rooney was lazy in any way as a footballer. You dont achieve what he did by being lazy. No way.
That dressing room he went into at Utd had unbelievable standards. Fergie standards so high. By all accounts the senior players ran training like a boot camp. Players like Keane and Neville made sure training was 100% all the time. Some players couldnt cope with it, but the fact Rooney went on to be Utd's top goalscorer tells me he relished it. I cant remember which manager it was but Rooney is supposed to have gone to them as captain and said training wasnt up to standard and it needs sorting. He also spent a lot of time training in a boxing gym. You dont get away with a lazy attitude in those places, no matter who you are, and I have been in a few with my lad.
He may not need to work, but he does. I doubt that is a lazy person tbh. I am sure he coule retire and live very comfortably. The fact he keeps putting himself into clubs like Derby and Plymouth suggests to me a big desire to be successful. He may not make it, but I reckon one thing it shows is he is a grafter.