Everything was fine with a 4-3, it's worked for the past decade, so then why switch to a 3-4? I know Shanahan knows what he's doing on the offensive side of the ball, but I think he's clueless on defense. In his tenure with Denver, they had an explosive offense but it had to carry their lackluster defense.
I say there's no need to go to 3-4, but Shanahan will let Jim Haslett deal with it. Why are the 'Skins starting from scratch to an area where they've found the most success?