ARLINGTON -- Dak Prescott was sharp, decisive and in complete control of the Cowboys offense Saturday evening.Kellen Moore wasn't.If there's any doubt about where you fall on the glass half empty or half full debate as a Cowboys fan, this should settle it. Did you come out of the team's 24-19 win over Indianapolis ecstatic about what you saw from the starting quarterback in his preseason debut, or did your gnawing concerns about Moore's ability to back him up push that to the background?Are you optimistic for what this season holds with Prescott in charge of the offense or scared to death of what will happen if he goes down for a game or two?One last question: is Aug.