Sami Zayn’s shoulder injury will be for us one of those memorable heartbreaking moments in WWE history. Perhaps the best everyman underdog of all time, on an iconic RAW debut against John Cena (that very much echoed Cena’s own iconic debut against Kurt Angle a decade ago), dislocated his shoulder before he even entered the ring as he swung his arms to rouse the crowd. He wrestled the entire excellent match on a bum shoulder…