Avery Brooks played Sisko as a reserved guy who was not that emotional in the first few seasons. Starting around season 4 he became more emotional and aggressive. He had a pep in his step and seemed more confident. This change made sense to me mainly because he had started to bond with his staff, had gained the loyalty and respect of Kira and Odo, and really cared about his mission. However, there are 2 episodes in season 3, Past Tense and Through the Looking Glass, that make me wonder what it would have been like if Brooks played Sisko differently from the start. The way he played Gabriel Bell and Mirror Sisko, is so different than Sisko in seasons 1-2. Do you think Brooks could have started off playing Sisko with some of the passion and intensity of Mirror Sisko or would if have seemed out of place and risked turning viewers away?