An interesting part of this story is that Google knows full well who that person is (unless they've been giving out $3.5M to a lot of people...), and leaking that story to TechCrunch makes Google look desperate and less interesting than Facebook.
Especially knowing that they just fired the person that leaked a positive (though confidential) memo that was addressed to 23,000 people. (that is, not super private to begin with)
It feels a bit like biting the hand that just fed you a huge amount of money.