Mark Sanchez needed an aisle seat at “Fela!” the other night to keep his left leg extended during the performance. The Jets QB — who had not one, but three beautiful women with him — had surgery last month on a knee ligament he originally injured playing for USC. Sanchez had two surprises. First, his fellow Jet, 360-pound tackle Kris Jenkins, was there. Second, “Fela!” star Kevin Mambo went to USC, too. When Sanchez came backstage, the two reminisced about teachers and dorms. Sanchez told Mambo he loves the show and plans to return with teammates.