(Photo courtesy of Esther Lin/Getty Images) In the wake of Rory MacDonald’s UFC 158 injury withdrawal ”” which is now confirmed to be a severe neck and back strain that will sideline him for three to four weeks ”” the UFC has shifted some talent around to make sure all the welterweights on the St. Pierre vs. Diaz supporting card still have dance partners. As previously reported, MacDonald’s scheduled opponent Carlos Condit will face top 170-pound contender Johny Hendricks, who was originally supposed to face Jake Ellenberger. (The UFC first offered the Condit fight to Tarec Saffiedine, who reportedly declined.) Now, Ellenberger’s replacement opponent at the March 16th event in Montreal will be none other than Nate Marquardt. The fight will be Marquardt’s first appearance in the Octagon since he was fired from the UFC in 2011 due to a testosterone-related misunderstanding, then reappeared in Strikeforce as a welterweight, KO’d Tyron Woodley to win the promotion’s vacant welterweight title, and lost it last month in a painful decision loss to…Tarec Saffiedine. See? It’s all connected, man. [*Huffs more keyboard duster*] And there’s one more element that makes this story even more confusing…