By Gerald Imray AP Sports Writer RIO DE JANEIRO (AP) — Ashton Eaton retained his title as the best all-around athlete in the world by tying the decathlon Olympic record and, within minutes, had stepped back for track and field’s ultimate superstar to take center stage again. What more could the now two-time Olympic champion Eaton do Thursday night to get just a little sliver of the limelight that beams down so brightly on Usain Bolt? Not much. “I had the pleasure of being in the same era as Usain Bolt,” Eaton said. “I mean, the guy’s last name is Bolt, he’s the fastest man ever, you can’t write a story like that.” You can try. For his own tale, Eaton made it back-to-back Olympic and world