FWIW, JT mentioned in both his pre-Purdue Tuesday presser and today's call-in show that nothing Purdue has done in the second half of any of their games this season is worth analyzing.
OSU is essentially breaking down only Purdue's first half film, as Purdue has 18 returning starters (7 of them seniors on defense), so the Boilermakers are rotating their defense heavily in the 2nd half of every game trying to manufacture depth and get some guys prepared for 2008 (there's a hint in there for Charlie). As JT pointed out today, all the opponents have lit up Purdue's secondary this season in the 2nd half, because of the combination of the defensive rotation and the fact that Purdue has been up so big that other teams are forced to throw to try and claw back into the game.