Side question, but I really don't understand what you're saying here:
The net net of it can be summed up as, in 48 minutes of play, he's +5.7 at SF, -2.3 at PF. That's a pretty compelling difference. The first is near all-star level. The latter is bench player.
A) How did you get to 'near All-Star'? Is there a database you're comparing this to, or is it something you just know from looking at 82 games numbers?
B) Just so I'm sure here, you're only using Green's pp48 vs opposing SF's pp48 (and the corresponding #'s for PF), right?
C) How many minutes did Jeff Green actually play at the SF position with Boston last season? I'm coming up with right around 400.
If C is true, Green also played ~400 minutes at the 3 with OKC in '10, and his numbers look dramatically worse there.
Of course, right after I write that, I look at his '09 numbers and offensively he looks about teh same as he did in Boston (although way worse defensively.
I guess what I'm saying is that there doesn't seem to be an over-abundance of evidence showing that Green is at a 'near All-Star' level at the 3, at least to my eyes. He's got a small sample size of good play as a second unit player.
Josh Smith has a career as a starter at the 4, with some time at the 3, and in that he's consistently out-performed Green.