Low end is what we're looking at if the OL is bad. High end is if our OL is at least solid.
Our defense has the potential to make a difference there too. If they're middle of the pack like last year, though, it won't factor in too much in the total regular season wins. If they're a top 10 unit then you're talking a game or two. If by some miracle we have a top 5 defense, however, I think the team's cap is a couple games higher.
Another thing to consider is the playoffs. There are playoff teams and playoff teams IMO. The ones who have defensive flaws and are one-dimensional on offense tend to get upset even when they have a big win total. So much of that (i.e. where the Rams fall in terms of playoff potency) will come down to how good the defense is and whether we can run the ball and keep things balanced.