Donruss Elite's fabled Throwback Threads insert has enjoyed a hobby hall-of-fame career since bursting onto the scene in 2000, enchanting collectors with elegant unions of football's greatest players -- along with their legendary game-worn memorabilia and autographs -- on one card. In fact, some of the most poignant two-player pairings in the history of sports cards have called a Throwback Threads checklist home.…