On a side note I could have been wrong about Grimm teaching man-to-man blocking scheme. I found an article about the Cards and in the end it says only time will tell if the scheme works for them. I think they are refering to zone blocking. Also if I'm not mistaken I think I keep seeing the Steelers used some type of zone blocking.
Zone Blocking Versus Man Blocking & What it Means for the Arizona Cardinals - Revenge Of The Birds