He has done nothing. Yes, the Cowboys won super bowl XXX two seasons later but it was with a majority of players that were already on the team before free agency and just a few FA signings, most notably Deion.
There are only 15 Giants that played in the last super bowl match up and only 7 Patriots. That means there are 38 NEW Giants and 46 NEW Patriots since then.
Think about that. 38 and 46 NEW players in just 4 off seasons and both teams are back in the super bowl. And the Giants made the playoffs 2 times in those 4 seasons and the Patriots 3 of 4 seasons.
What is the difference between the Cowboys and these 2 teams? Jerry. He does not know how and cannot handle the free agency and salary cap rules. The 3 super bowl victories were achieved with a team that was built pre-free agency and salary cap.