The Pats didn't think Oher was good value in the 1st round. They felt Vollner was better value in the 2nd (58).
The team's biggest problem the last 3 seasons has been pass defense. Thus, the drafting of Chung and Butler in the 2nd round.
Of all the OL, the Pats only drafted Mankins in the 1st and that's because there was no other player available at any position worthy of a 1st when they picked. They may have been interested in Marlin Jackson before Indy took him, but I digress.
IMO, BB was probably giggling like a schoolgirl when Butler was still on the board at 41. I also feel that these last two drafts will bring the Pats back to SB success. I'm that high on their picks.
The Pats system is based on value and need.
Sure it's easy to bash the OL after SB 42, but despite that unit's poor showing, the team still had a 4-pt lead with 2:15 only to see the pass D blow it in the end (83 yard TD drive).
KC Joyner, a football sabermetrician, has stated that the Pats OL in 2008 was the best run-blocking unit that season. With Brady's quicker release, the pass blocking is expected to improve as well.
If Oher becomes a pro-bowler, who cares? That shouldn't diminish the potential of the Pats picks.