Has he? Because I see no proof that actually proves he is Satoshi Nakamoto. And Gavin himself told that he might have been deceived.
MEUCIQDBKn1Uly8m0UyzETObUSL4wYdBfd4ejvtoQfVcNCIK4AIgZmMsXNQWHvo6KDd2Tu6euEl13VT C3ihl6XUlhcU+fM4=
Converted to hex:
3045022100c12a7d54972f26d14cb311339b5122f8c187417dde1e8efb6841f55c34220ae002206 6632c5cd4161efa3a2837764eee9eb84975dd54c2de2865e9752585c53e7cce
this signature is not new though.. its been in our faces for 7 years. if showing the signature means the person is satoshi, then
i am satoshi
you are satoshi
we are all satoshi