Even though Calvin Johnson has erased all doubts about his supremacy among NFL receivers, the Detroit Lions need to complement him with a viable outside threat. The Lions don't have a healthy, experienced outside receiver on their roster to help the deep-passing attack. Their main free-agent target at receiver for now appears to be Darrius Heyward-Bey. But the 6-foot-2 speed merchant left Allen Park last week without a contract. According to USA Today, the Lions had offered a contract in mid-March to Domenik Hixon, a 6-2 outside threat who helped the New York Giants win two Super Bowls. But Hixon has been visiting other teams and, according to a person with knowledge of the situation, the Lions currently are not in play for his services. The passing game will get some significant help with the addition of running back Reggie Bush. And the slot position has nice depth with Nate Burleson and Ryan Broyles, although both are both coming off surgery. But the Lions still lack that outside deep threat opposite Johnson that helps produce the chunk yardage coach Jim Schwartz and offensive coordinator Scott Linehan covet.