[quote=@JohnWolff]
[quote=@The Silver Paladin]
He could have bound Michael to him much earlier in life, and then when the Grail was created, he bound Michael to the Grail.
[/quote]
If he were to do something so convoluted, it would have to be a good reason - like using Michael as a backup plan in case something goes wrong with the new Kyubey system.
[/quote]

Like using Michael as a path to God's Omnipotence. or as a path to become a heavenly being.