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Rooney was perhaps better at 18 than he is at 25
Rooney homers used to rely on his potential as a crutch. But now, having played eight full seasons in the English top flight, he is a very old 25. He looks more like Danny Glover than a mid-twenties British lad. The period when most of his improvement would have occurred is over. He has now plateaued.
Wayne hasn't added or changed his game for the better in several years. In fact, he's picked up some bad habits, losing the abandon and naivete that actually helped his earlier style. Having trained at the same camp for six years, in addition to the complacent influence of stardom he's projected, among other factors, has homogenized his current style. And quite frankly, he's not as good as people hoped.
Hernandez, a much fresher 22, has only begun to mature. Only last week he entered his first UEFA Champions League game, away to Valencia, and scored clinically with two expert touches, belying his supposed lack of experience. The Mexican international has netted against Spain, France, and Italy, among others, this year. He plays happy, as opposed to Rooney, and shows none of the stress and disturbance than mars Rooney's displays.
Hernandez might already be better than the Englishman. At the very least, though, he has plenty of growth ahead of him during which to prove it, while the English pugilist looks every bit his 431 senior appearances.
United aren't going to outlast Chelsea domestically, nor numerous better clubs abroad, throughout the long season, so there's really no reason why Hernandez should continually sit the bench at the profit of Macheda, Owen, or even Rooney.