There are a multitude of reasons other than "lack of effort". I've named several. My point is Internet GMs who profess to know a players level of effort are pretty ridiculous. Green Bay paid him 4x what they HAD to pay him. They named him the starter. I used to run my own business, I'd never pay a guy 4x what I could get him for unless I figured I needed to to outbid other people, and I'd NEVER pay ANY money to a guy I thought was a slacker over a protracted period of time. My philosophy proved pretty successful, so I'd imagine GB has a similar mind set.
As Paul mentioned, the issues with a lack of effort and motivation on Raji's part date all the way back to his Boston College days. You're the only one in complete denial about it. You have still not adequately explained how a supposedly great player like Raji becomes a one tackle per game type player with zero interior presence, unless it was from a lack of effort.
Please don't give me that "playing out of position" garbage. For one, you're talking about a position he played in 2010 in his best year, a position he's played most of his pro career. For another, great players are still great players regardless of where they line up. Matthews played half the season out of position and remained dominant. Lining up outside instead of in the middle doesn't prohibit a D-lineman from shedding blocks.
And you hiring employees for your business is not remotely comparable to how free agency operates in the NFL.