After having read through the entire thread, I'm going to attempt to solve Jeff Green:
Green is a talented basketball player. This cannot be denied. He's a great athlete, has a decent post game, can shoot well from the outside (especially in the corner), can finish around the basket, and is an above-average perimeter defender. The only real issues in his game are rebounding (biggest issue; a guy with his size and athleticism should be grabbing more boards), passing (not great, but not horrible either), and post defense (not that big of an issue).
As far as skill goes, Green has many tools that work to his advantage. He's a high-level backup and a serviceable starter. His contract is finally starting to make sense based on recent production.
What's really going to determine Green's future (that is, where he ranks among opposing SFs) is his mentality. As I've stated above, we know Green has all the tools to be good, it's going to come down to whether he until see them properly. It's been noted that Green's production has remained at the same level throughout his entire career, and that he's been known to be passive. These two points direct us to the thinking that "Green is what he is." That's certainly true, but, to play devil's advocate, Green has a) never had the opportunity to play SF full-time (he's played with Durant and Pierce) and b) never been asked to be a #1 option.
It could be argued that those two points are at the crux of Green's lack of aggression. He's had to defer to players better than him, thus taking away the opportunity for him to score.
That's one way to look at it. I tend to disagree.
In my opinion, Green is best-suited as a third or fourth option on a good team (title contender). I think his lack of aggression has more to do with his style of play (finishes plays, rather than initiates them). Green excels when he plays with others who can create for him. Another way to spin that is Green excels when there are other threats (aka players better than him) on the floor that the opposition has to pay attention to. When Green isn't pressured to be a #1 scorer, that's when he shines brightest.
So, where does this place Green among other SFs?
LeBron and Durant are head and shoulders above all. Carmelo is next.
This is where is gets tough. There are plenty of guys who are around the same level, and then there are up-and-comers. Let's take a look:
Pierce, George, Deng, Gay, Granger (when healthy), and Iguodala are all around the same level. Then, you've got guys like Green, Prince, C. Butler, Marion, Wallace, Gallinari, Chandler, and Kirilenko who all provide skills that are valuable. Finally, you've got the young guys like Leonard, Parsons, J. Butler, Kidd-Gilchrist, Barnes, and Aminu who all show promise as players.
In my opinion, Green will be top-10 without question. However, he'll be closer to 10 than 5 in my rankings.