4 and 5. Wes Welker and Reggie Wayne, wide receiver: We group these two receivers together because they face similar challenges. Welker has to prove to teams that he's not a risk because of his concussions, and that he hasn't lost his quickness. A disastrous season in Denver last year could be his last. Wayne had no explosion late last year, and underwent triceps surgery after the season. He's open to playing for teams other than the Colts, but it would be a surprise if any team bit.