Just defining leadership is tricky because so many see that differently.
I can play devil's advocate on this with Prescott as well. They were in games that they lost last season because he could not lift them as Staubach might have but then he had that Captain Comeback reputation so leadership was built in. Prescott exhibits leadership but is that true leadership or does it just look like it? Isn't the QB the one position that has leadership built in? A QB has to lose that like Cutler did.
We talk leadership but we don't talk about the other side of that, those that respond to leadership and I can tell you there are a lot of people that do not respond to leadership. For their own reasons, they choose not to be led, even when it's for their own good.
Dak Prescott acts and looks like a leader and has since I started watching him at Miss St. The one thing that stood out to me was coming off the bench to be the QB1 was if he had just been waiting for that. His high school coach and Dan Mullen, his college coach, both remarked about how he just took over and that word leader was used a lot. What he lacked in raw QB talent, accuracy, he made up for in one single leadership trait, doing whatever necessary to make the play, including sacrificing his own body to do that. Nothing is more leadership oriented that that one thing.
Wasn't that the Staubach trait? He'd stick his head in there to gain a yard and get knocked silly doing it, caused him to retire early but he only had one mode, all out. His players knew that if they gave him the time he would get it done or die hard trying. And that is all anyone can ask of a leader.
Leadership back then was a lot easier when they could keep a team together and trust building was accelerated. Unless the QB is some superstar like Mahomes, it takes time and if you noticed the Chiefs in the offseason, they went overboard to keep his team together and it showed last night as did the Texans lack of doing that on offense.