While selectively leaking certain emails and withholding other might color an issue it won't make a negative into a positive. And if the leaked emails aren't genuine I have not seen any claims to that effect. So either they are real and they paint a real, possibly distorted picture or they're false but as it sits right now they are the evidence that people use to build their opinion on. If there is an email trail that establishes a different narrative Google is of course perfectly free to release that too to offer some counter weight.