He came up with the piece before the album. The album version was produced and engineered and all that crap.
I vote that if Eddie is playing it, it is always "correct". Although I know he has said he made a mistake on the album version. It is funny that 35 years after that album, it is still considered the water mark for having great technical ability and guitar prowess.
Stick those youtube kiddies in front of a live audience and have them play in time with a real drummer. Not saying all of them couldn't do it but many would probably have an epic fail.
I admit, Eddie's etude is fun to play though.