I, too, have been listening to Napear's show daily here, recently, and I do not recall him saying any such thing. He has said, repeatedly, that he doesn't like it when athletes sit out when they're physically capable of playing.
A couple of notes:
1) This is very consistent with Grant's history - remember when he shockingly ripped Bobby Jackson for being soft and not playing when Grant thought he wasn't injured as bad?
One of the lowest times of the show, IIRC.
2) Grant has previously been WAY more aggressive and blatantly slanderous/muckracking against Demarcus.
I looked up one of my old posts and saw that it was sometime around Dec 15, 2012 when Grant suddenly started slandering Demarcus, week after week on his show. It was WAY worse than how he talks now. He was pretty clearly setting the Maloof's talking points about Demarcus, many that have persisted to this day.
As I've said before, Grant has personally done more damage to Demarcus' reputation in the NBA than any other one individual (except Demarcus).
What I don't get is -
It is obvious to every reasonable person following the NBA that the Kings FO didn't want Rudy or Cousins to play the last part of the season. Wins were simply not what would help this team. The way DMC and Rudy tag-teamed and passed off their nights off was really blatant assisting the tank job we succeeded in.
Tanking is a HUGE topic in the NBA lately - I feel the NBA does look closer at tankjobs nowadays and will come down on franchises who are too blatant.
One of the ways franchises can cover tankjobs is if they create plausible deniability about their star's injuries and rest-nights.
So here's a positive, uplifting, pull-y'all-back-from-the-ledge conspiracy theory:
* Grant and Karl are saying they don't want Demarcus to sit out simply to cover the fact that they DO want him to sit out. Both of them are FO mouthpieces, remember.
Does anyone really think that Karl hasn't spoken to Demarcus? He just had finished saying he talks to these guys so much they are probably sick of talking to him, that's why he's not big on exit interviews.
So Demarcus puts up the "this is a dirty business" tweet because he doesn't like being the fallguy for the team's tankjob's plausible deniability. But he understands the need for it.
There ya go! A happy conspiracy theory that minimizes the conflict in the team/franchise.