I'm sorry, but you can't blame a talented operations guy (among the most talented in our industry -- he led the Pixar IPO) for Twitter's failure to innovate and grow. Especially when you factor in the constant absence of the guy who is supposed to be in charge of product, who spends more of his time tending to his overhyped payments company.

The lack of a transformational acquisition probably didn't make him very happy either, as it's hard to see how Twitter's current product mix moves the needle in any meaningful capacity.

Twitter's loss.