The line was better, but not like we could just line up and run the ball by handing off to a running back. 3 of the top 6 rushers from last season were the QBs with HH leading all rushers.
Now, most of that (my opinion) was due to having an absolutely horrendous passing game. Opposing teams didn't need to respect the pass (QB lack of talent and WR injuries) so they could just load the box.
I expect the line to look better due to improvements to QB play and WRs. That will force teams to respect the pass and our line won't be trying to run block against 8-9 man boxes. Better QB play that can exploit our TEs will go a long way.
The above issues will solve our running game much more than whether Ervin, Dowdell, or a Johnson starts at RB. There isn't a ton of separation between them. A healthy Ervin last year wouldn't have significantly move the needle on our rushing game.