By Shawn Childs A dynamic duo in the Cowboys backfield presents an interesting conundrum for fantasy managers. Looking back at 2021, the Dallas Cowboys had the best offense in football, but none of their skill players had an elite season. WR Amari Cooper (68/865/8) fell short of expectations, and WR Michael Gallup (35/445/2) missed eight games. WR CeeDee Lamb (79/1,102/6) improved slightly, but he failed to post a difference-maker year (19th ranked wideout in PPR formats) despite his preseason hype. RB Ezekiel Elliott gained over 55 rushing yards only once over his final 11 starts, leading to …