Leadership on this team WAS a major issue for this team forever, and to deny it is revisionism.
Austin, Rat, Barber, Ware, RW31, TNew, Romo, Witten, James, T.O., Crayton, Spencer, etc. were the Core players for years, and for years we did little from a team standpoint. Geez, these guys quit on Wade.
Most of these guys (TNew, Ware, Romo, Witten) were lead by example players, some of the others were malcontents or cancers (T.O., Crayton, Rat), and some fancied themselves as leaders (James, RW), but weren't great enough to have followers or just weren't good at it.
For years, fans, myself included, felt that this team had a true leadership void and were summarily mocked. Remember Brooking stepping in as a real leader within weeks when James, Ware, etc. were already here? I don't think it's a coincidence that we're a MUCH BETTER team now than in recent years with most of them gone.
Yes, Romo and Witten are still here, but I'd argue that Dez, Lee, McClain (in a very short time), Fred and even OScan are the players who have changed the culture of this team for the better.
Admittedly, Romo and Witten (especially) have grown to become better leaders, but IMO, it's the younger guys who have put this team over the top mentally and brought some fight to this team.