I would think its an artificial arm, due to the fact that Cloud encountered him on the Mansion Basement, where the old crazy man was researching stuff and making experiments... Maybe Vincent was one subject...
And In Last Order, Zach and Cloud were taken by Hojo for experimentation after fighting and losing against Sephiroth... When I saw the movie, I thought Hojo had done some experiments on Zack, and that Zack became Vincent... But I don't think that is true..
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"Oh Cloud! Your hair looks like a chocobo!!" - Tifa, Final Fantasy VII
"You'll cry. You're gonna cry. You always cry, see? You're crying." - Jecht, Final Fantasy X
"Fine, we rest. She's worse than the storm." - Auron, Final Fantasy X
"...Whatever." - Squall, Final Fantasy VIII
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