Whatever guys the teams Edge ran against are and were much tougher teams than the chumps TH has been failing against.
Just a quick comparison of the rankings of the defenses faced by James and Hightower. Yardage is listed, then average per carry, and then the opponent's rank, first by raw yardage allowed, and then by yards per carry.
It's actually striking how few bad run defenses the Cards have faced. The Rams are legitimately putrid, but the Cards ran well against them. The Bills are bad, and they didn't do that great. Other than that, even the Seahawks aren't that terrible when you look at the average per carry allowed. It's obvious that part of their bad raw ranking is teams choosing to run more late in games they're out of.
James
Week 1 SFO - 100 yards, 3.8 per carry. 14th, 7th.
Week 2 MIA - 55 yards, 3.1 per carry. 9th, 9th.
Week 3 WAS - 93 yards, 5.2 per carry. 7th, 11th.
Week 4 NYJ - 29 yards, 3.2 per carry. 3rd, 4th.
Week 5 BUF - 57 yards, 2.7 per carry. 20th, 22nd.
Week 6 DAL - 29 yards, 3.2 per carry. 10th, 17th.
Week 8 CAR - 17 yards, 2.4 per carry. 17th, 14th.
Hightower
Week 9 STL - 109 yards, 5.0 per carry. 30th, 29th.
Week 10 SFO - 22 yards, 1.7 per carry. 14th, 7th.
Week 11 SEA - 35 yards, 3.2 per carry. 22nd, 14th.
Week 12 NYG - 21 yards, 1.9 per carry. 6th, 9th.