I don't understand PFF sometimes. Spain's grade is pretty solid, but he was part of the notoriously terrible Bengals line and the Bengals couldn't wait to replace him and others from that group. I wonder what gives.
I don't get PFF at times either. I used it for reference because, well, there isn't any other measure out there to gauge player performance that is considered credible. At least not that I am aware of,
The Saints must not take much stock in PFF's grades, as they signed OL Josh Andrews, who has never graded well, and they have Senio Kelemente in for a tryout after his 40.0 grade last season. Hopefully he was playing hurt or something, because I am certainly a Kelemente fan.