I get your point Brick, but you're cutting some of the players short - Horry, Hassell, Elie, Harper, and Afflalo can shoot and score, they just chose not to; and some of them can even dribble, pass, and in short spurt run the plays. Greene can't do any of that with any consistency. And on top of that Greene is not as good as those guys are defensively. So essentially you're comparing Greene to guys who are simply better. That's where I think the disconnect is. Greene's game right now is much closer to Jamario Moon than Robert Horry. And I can guarantee Moon will never find himself playing a prominent role in a championship calibre team.
And yes you're right that that defensive player goes by many names. So many, in fact, they are found on just about any NBA team and even more can't even get in the league. The supply of such a defensive stalwart outstrips the demand making it pointless to hog such a player.
While Greene's defense was at times good, occasionally great, but also at times not so great. What was the reason for PW switching Tyreke to guard KMart after two minutes of Donte guarding him? Is it because PW saw that Donte can't guard Martin? What is the point of having a defensive stalwart if it still ends up with your franchise PG guarding the opposing team's best weapon? I think there are still question mark about Donte's defense, I don't think he is the great defensive stopper that he's made out to be, at least not yet. I don't mind giving him minutes until such time that he plays better (maybe even on the same level as the guys you mentioned) and thus earns the starting job or the Kings find a better replacement.