I disagree. Pass rusher is one of the easier transitions from college to pros on the defensive side of the ball. Johnson does not bring anything to the table as a pass rusher entering year 4. Mario Addison in the worst season of his career was significantly better Johnson.
I don't see Johnson as anything more than a core special teamer. With Neal, Jones and Mykevich(sp) how many core teams players can you keep? Give me DEs who can rush the passer, the one they cant they snagged a 6th rder in return seems like a net gain.