I think you are on to something here as one of my thoughts (hopes) re: 2015 Bills O is that though we have clear failing in terms of having a great OL that I might be that if Roman develops a good running game it on the face of it creates a big challenge for the opposing D.
Opponents will have an initial choice to make whether they are going to cheat against the run by 7 or 8 defenders in the box (even a talent like McCoy gets stymied by this D particularly if our OL is average or worse). However, this commitment to stopping the run likely gives either Watkins or Harvin single coverage. A mere stop and go and an easy read by EJ of which way is the safety cheating gives us a quick TD.
On the other hand, if the opposing D doubles either WR (or both) McCoy simply has to beat the first tackler and he is running with a head of steam in the second level.
Now add to this quandary, EJ after making his initial read has an O which can:
1. Have Edwards do his precise route running if the D goes zone against our 3 WR set
2. The versatile Clay either focuses on blocking if our 1st option on a play is a McCoy run, or we go play action and Clay after a chip block slips into the pass pattern, or
3. EJ 's main job is to look for space and give Harvin/Watkins time to lose their coverage and Manual simply read-options his way to either run for a first or throw to the open receiver.
Overall, I am not worried about our OL as EJ escapability he has shown in essence gives us an extra blocker.