How is Gilgamesh still alive in Fate Stay Night?

There was more than enough mana to grant Gilgamesh a human body, bring Kirei back and also to destroy the entirety of Fuyuki City. What is this? So, in short, Gilgamesh survived and became human at the end of Fate:Zero because the excessive convoluted mana that spilled from the Grail gave him a tangible physical body.
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