While the only point here is that we are undeniably a superior franchise to the Commanders, the case can be made that we are the most successful NFL franchise, and therefore the greatest. See here:
http://www.nfl.com/superbowl/records/playoffs/team/games
Most Seasons making the playoffs:
Tie for first place: Dallas and NYG (28)
Most consecutive seasons making the playoffs:
First place: Dallas (9)
Second Place: Dallas (8)
Most games in the playoffs:
First Place: Dallas (55)
Second Place: Pittsburgh (46)
Most playoff games won:
First Place: Dallas (32)
Second Place: Pittsburgh (28)
http://www.nfl.com/superbowl/records/superbowls/team/games
Most Super Bowl Appearances
First Place: Dallas (8)
Second Place: Denver/Pitt (6)
Most Super Bowl Won
First Place tie: Dallas, Pittsburgh, San Fran (5)
We are leading the entire NFL in Playoffs and Super Bowls, appearances and wins. That means we either are the greatest NFL team or that we are at least in the argument as greatest NFL team.
Know which team isn't even in the argument? The inferior Commanders (noticeably absent from those lists).