I don't pretend to understand defensive line play beyond the obvious. I don't know what their assignments truly are (occupy blockers? penetrate and disrupt? stop the run?), but whatever Raji's assignments have been this year he sure hasn't produced much of a measurable impact.
In any case, at the time of his career when he should be playing his best he seems to playing the worst football of his career.
What do the Packers do? How much should they spend to get him back? How lucky are they that Raji didn't take that contract offer? The Packers don't have a lot of other options at the position, and Pickett isn't any younger (and btw, to my eye both Pickett and Jolly clearly out-performed Raji this year), so maybe they need him to come back. But jeesh, what a disappointment.