That's all that use to determine who the best was?
This reeks of advance stats that basketball has. At the end of the day these are only guidelines, not proof. Offensive lineman can give up hits or hurries even by doing their job. If you have a quarterback holding onto the ball because nobody is open, but you end up giving up a hit as result of not being able to pass block someone for 5+ seconds or more....that's not really a mark against you, IMO. In that case the lineman did his job.
Obviously not all are like this, but when context is taken out of a play and defined with formulas such as this one, it doesn't really matter.
If Justin Hartwig was such a fine player the last three years, the "number 1 graded center in the league from 2008-2010" like the site says he is, there's no reason he would've been cut from a team at the time sporting one of the worst OL's in the league, especially when he could have been retained for a decent price.
Just saying. Let's not pretend this formula has the final say.
I'm glad the voters went Andy Lee over Lechler. I mean both were deserving the numbers are unbelievably close but Lee set the record for net punting yardage. A good amount of that has to do with coverage, but he did it WITH A BLOCKED PUNT ON RECORD!