Consider this, once Darren Young returns he comes back a face. Obviously this would be on RAW, and I think he should change his hair style, and wear some street clothes. Without knowing it, the Nexus would falsely attack him while his back was turned, and they would think that he was Cena. Lets say Sheffield says he saw him earlier, and knows it was Cena he saw earlier.
Then, once the chaos erupts it turns out that they attacked Darren Young, who came to RAW dressed in casual clothes because he wasn't set to wrestle. Shocked by not realizing what they have done, they run off confused. Perhaps later on that night, should Cena get a beatdown, out comes Young to his rescue. Then, the following RAW Cena/Young dressed the same trying to confuse the Nexus.
Then, once the chaos erupts it turns out that they attacked Darren Young, who came to RAW dressed in casual clothes because he wasn't set to wrestle. Shocked by not realizing what they have done, they run off confused. Perhaps later on that night, should Cena get a beatdown, out comes Young to his rescue. Then, the following RAW Cena/Young dressed the same trying to confuse the Nexus.