No the point is not comparing Dak to Brady, it's Purdy to Brady. Purdy nor Brady HAD TO LEAD on a stacked team where there was veteran leadership. We are all Cowboys fans and understood what happened in 2016: Dak not only took the job, he took the locker room over too. As much as Jerry wanted to give Romo that job, the locker room would have died had they given the job back to Romo. Same thing happened with Purdy and Trey Lance. The POINT - which goes over your head - is that winning does not equal leadership and losing does not equal lack of leadership.
Again - LEADERSHIP DOES NOT ALWAYS MEAN THAT IT WORKS OUT FOR YOU. Perhaps that's why most people are NOT leaders and don't understand them...because leaders know and accept that things may not work out. Those who only are fit to be led are like delusional children who only see "leadership" when it all works out. Nothing could be further from the truth.
Purdy may GROW into a leader, but he is not the team leader and neither was Brady when he won his first SB. But yes, over time, he did develop into the leader of that team.