Because his grandfather was the original rey mysterio and he wore a mask rey is rey mysterio jr
Yes the restless leg syndrome and back and neck injuries are stopping him wrestling if he had continued it might have ended his career the wwe made the storyline so jeff could recover
You can't simple you need oaks letter you could trade the letter with a friend who has it
Yes he left wwe to recover from neck problems he also has restless leg syndrome and damaged plates in his back so he is recovering. Ill prove it type jeff hardy into wikipedia.