YahooHenrique de Castro was a top ad guy for Google and, in October 2012, Marissa Mayer‘s first big hire after she became Yahoo’s CEO. But the relationship soured as Yahoo‘s ad sales failed to inspire — and the company says today in an SEC filing that he “will be leaving the Company effective January 16, 2014.”  Yahoo reported disappointing ad sales in Q3, leading Bernstein Research’s Carlos Kirjner to observe that “the core remains challenged, particularly in its display advertising business.” Don’t cry for de Castro: With special sign-on incentives, his compensation package in 2012 totaled $39.2M, beating Mayer who made $36.6M. He’ll now collect much more in severance benefits.