In general, your quicker pass rusher works the left side (vs elite pass protectors) and your stronger run stuffer works the right (as he will often have to take on the TE as well).

The real problem the Steelers have is that both Worilds and Woodley are LOLB as neither has great quickness or suddenness and both rely more on size and strength. Chris Carter has the quickness to play ROLB, but to this point, he has not produced. I think they will draft another pass rusher in the first 2 or 3 rounds.