Again, biased news. The Redskins officially came out that they were going to the 3-4 around the combine, so early March roughly. They signed Kemo March 10th, who was obviously going to be a NT. Haynesworth holdout started in... June.
Haynesworth was never going to be the NT, so him slimming down to 320 or so isn't that big of a problem. The bigger problem is asking a guy who loves to try and make plays to just occupy blockers. The Lions got rid of Rogers for that reason and the Browns are trying to control Rogers in the same way, but it just doesn't happen. How are you going to tell a guy who just tackled a guy for a 2 yard loss that he technically was playing wrong?