I understand what you are saying Adam and I haven't worked the numbers, but my gut feeling from watching is that Barber's distribution (taking out short touchdown runs for all RB's) would have a MEDIAN or a distribution that is slightly better than Julius Jones'. I do agree that the average distribution you are talking about is standard accross NFL and has likely been for years. AVERAGE is a bit misleading like you said. Short Touchdowns, and singular or a few very long runs throw off the picture. That is why IMHO taking into account MEDIAN, and to a lesser extent even MODE, makes a more thorough picture.
Negative runs are like sacks, very hurtful for psychological and down and distance reasons. My unverified opinion with regards to Barber vs Julius (and other similar back for that matter) is just that Barber so aggressively fights for that extra yard or two, lunging, diving, digging, driving. That extra yard or two every 2nd or 3rd run is underrated if you asks me and shifts that distribution (bell shaped) curve to the right just that little bit, that I think makes all the difference for an offensive running game.
This is why IMHO (again) I though Emmitt was such a much more effective RB than Barry Sanders. Sustaining drives as you mention in this thread or another Adam is important. You are right, the offense played a big part in loss, because it went 3 and out so quickly so often against 'Skins. The other thing is if you pass all the time and go incomplete alot and the other team is running on you, they completely control the game clock and game plan and often field position, as the 'Skins did to near perfection on Sunday. Give Skins credit they gameplanned us and followed it well. Intersting, Divisional rivals know you so much better, which is why those Division games can go any which way.
A 4 yard running average is considered a necessity in NFL. Like Adam says, how that 4 yard average comes about is actually very interesting. I still think Dallas was spoiled through the nineties and got used to CONSISTENT 4 yard gains by EMMITT, and we are now seeing more the traditional distribution be it with Julius Jones, or Barber. It's nice to have the potential weapon in Felix Jones to throw that distribution off a bit. I'd like to see Felix Jone's distribution after 100 runs in his NFL career. Wonder what it would look like even if he's averaging over 6 yards hehe. 1, 3, 0, 72, 3 ....hehe.
LarryCanadian