1. The Eagles OL is horrible and they gave up 23 sacks on Sanchez in 8 games started last year. That's 7 shy of Romo, in 15 games.
2. Since when does 20+ runs, that don't end in scores, qualify as home-running? It could, provided the run breaks not only 20, but maybe 35 or 40.
Convenient that you essentially ignored the stat of 40+ yard
Looking at Murray between 2013 and 2014, Murray jumped from 8 to 18 20+ yards per run, but his 40+ stayed at 3. He went from 217 carries to 392 carries, so with 108 more carries, Murray still couldn't increase his "home-run output". And the fact that his 20+ output increased, shows he was probably getting in the backfield more to capitalize on the opportunities to take on to the house.
Looking at a guy like Foster, who ran the ball 100 times less than Murray, he had 3 +40 yards last year and he was the number 2 runner. Going back a year, when McCoy was the man, he ran it seventy times less and had the same home run output. None of these guys even sniffed close to the numbers of Murray in terms of opportunities whether this year or last year.
And neither Foster nor McCoy were afforded the luxury of a passing game like the Cowboys, especially when their QBs sucked to threaten the run as much. And none of your post addresses the issue of 1000 yards of Murray being obtained before even getting touched by the first defender to allow him to get going.