There is something to be said for getting it right w/ regard to the DE position in a 3-4. Aaron Smith of the Stillers is a classic example of this. He's a guy they drafted, plugged in @ DE, and haven't looked back. That said, I agree that unless you have a quality nose to anchor your D line, you'd better go get one. Raji is being used @ DE for Green Bay due to his footwork and their belief that he can handle the 5 technique. I think he can, but I also think he can be a solid nose.
If it were me, I'd have looked to draft his college teammate, Ron Brace, w/ my 2nd round pick. That would've allowed me to either try to move down or to take a guy like Raji, Orakpo, or even Larry English (a stretch w/ the high pick, but still a guy who would fill the bill as a pass rusher) to give me more of a push in the pass rush. Their bigger problem is what to do w/ Glenn Dorsey, a guy who is an excellent fit in a 4-3 scheme but is miscast in a 3-4, plus has a contract that makes it very tough on KC to actually move him now.