Nothing in her resume actually suggests she had the experience for what Google needed. VMware became popular in a similar way to Redhat, in that it solved a technical issue nobody else was solving at the time. It didn't have explosive growth until EMC took over and with it EMC management style/structure. She was just along for the ride the second the company was sold to EMC.
>What will help Thomas succeed in this role?
He was in a position of power in what is one of the most successful sales organizations in the history of tech. I don't like Oracle, in fact my post history will show that I loathe them. But their salesforce has absolutely dominated the tech industry for 2 decades+. Google needs someone that knows how to sell to enterprise, they don't just need another nerd at the top. Based on my experiences with Diane she was an extremely gifted technical talent and an extremely poor saleswoman and leader.