I think looking at sacks is a bit misleading when it comes to gauging how well the OL protected Tommy last season.
Tommy was masterful at scrambling and evading pressure, something that I'm guessing Lee won't be as adept with. So I think a true gauge of the OL effectiveness lies in QB hurries statistic. In other words, how many times did Tommy have to scramble or was hurried because of the pressure.
Even still you'd then have to attribute how many of those hurries were scheme related (i.e., right personnel, wrong scheme) or personnel related (i.e., right scheme, wrong personnel).
On the surface i think our OL will be suspect this year, which will affect Lee more than it did Tommy. Tommy made our OL look better than it was, I think the opposite will be the case here.