I think Dick is actually a pretty good CEO and told a good story and had a good vision for Twitter as a business. It was just a vision for "Twitter as it exists right now" which is what a hired gun CEO is going to have a vision for. I can imagine Dick being a great founder/CEO.
But yes - surrounding Jack (pre-Evan switch) with a STRONG #2 was the move. When that didn't happen, can't blame them for not seeing it at the time!, Dick was probably the best they could do. Still, it's sad. Evan's vision for Twitter was correct and more obvious now than ever.