I always admired Walt's optimism. He seemed to know the direction he was going to. When I was at the studio, I remember he kept driving all of us back down to a more fundamental level all the time.
But Walt and him shared the same kind of optimism. Walt believed in himself, and he was optimistic about what he wanted to do. He just knew it will be okay, and Dali was the same way. They had a great deal in common that way.
Hope is definitely not the same thing as optimism. It is not the conviction that something will turn out well, but the certainty that something makes sense, regardless of how it turns out.