I seem to recall the Browns running game going into the toilet after Alex Mack broke his leg midway through the 2014 season and Greco filled in at center. Cause and effect?
The running game has never been great, but never been as bad as it seems. A comparison from last season. Browns vs the best rushing attack in the NFL, Adrian Peterson's Vikings.
Adrian Peterson - 327 attempts for 1,485 yards at 4.5 per carry.
Crow and Duke - 289 attempts for 1,085 yards at 3.7 per carry.
If you extrapolate for Peterson's additional carries, Crow and Duke would have 1,209 yards on the same amount of carries. So 276 yards more. Is that because AP and the Vikings are elite, or because the Browns suck? Personally, I think it's because the Browns lose.
Adrian Peterson, last season, half by half and quarter by quarter.
First half - 3.6 YPC
Second half - 5.7 YPC
Q1 - 3.8 YPC
Q2 - 3.2 YPC
Q3 - 4.9 YPC
Q4 - 6.9 YPC
As we see, Adrian Peterson was dominant in the second half and the fourth quarter where his yards per carry spiked significantly. The second half account for 827 of his yards on only 144 carries.
I honestly don't think the Browns have sucked on the ground for the past two seasons, we just haven't been able to run the ball in the second half because we're desperately trying to pass our way back into the game. Of course, this isn't specific to the Greco at C era, but that was no different than what is still happening.
I think the Browns have put way too much stock into trying to fix the running game - Trent Richardson, Terrance West and even Duke Johnson are a lot of draft picks for Crow to ultimately be our guy. Once we fix the team, I think this rushing attack is going to be straight fire.
Long story short, I don't think it's overly any specific area that is causing the rushing offense to stutter, but rather the totality of issues that losing football forces on a rushing offense that creates issues in generating a successful ground attack.
Also worth noting on top of those rushing numbers - Adrian Peterson added 222 yards through the air, but Crow and Duke added a thunderous 716 yards in the air. Accounting for that actually offsets the ground difference and makes both backfields, in terms of touches and yardage, quite similar in their productions.
Adrian Peterson - 357 total touches for 1,707 total yards.
Crow and Duke - 369 total touches for 1,801 total yards.
Not bad, all things considering.