Do we know that he is a worker and cares? He seems to have worked hard coming into the league and during last season, but that was when he was trying to earn a spot in the league and secure a future for hm and his family. The motivation is very different now and to be honest this summer it doesn't seem like he was much of a workhorse. I mean, he obviously put in work, but we don't know that it was more than an average player.
As for the care factor, I don't think that a recently return missionary (so they aren't biased by last year) would watch this year and think DM has a high care factor or joy/love for the game (as opposed to Rudy). I remember him last year being hungry and energetic. Think of all the rim highlights, or pushing in the open court, or second effort plays from last year. This year they are basically gone. He went from being somewhat comparable to Westbrook, to just an average dude.