I'll be extremely disappointed in Danny if he just lets Jeff go, though.
I comes down to how much you pay him. In my opinion, Green isn't worth much more than the MLE. He's a mediocre scorer, a mediocre defender, and a poor rebounder and passer. Guys like that aren't worth the $10 million per season he reportedly asked for.
Guys like the one you're describing shouldn't even be in the NBA. Overreact much?
In what area am I overreacting?
His scoring is very average, especially on a per-minute basis. 14 points per 36 minutes just isn't anything better than mediocre / average. He's also a pretty average shooter.
His defense is average (mediocre) at best.
His rebounding is poor. His passing is poor. Obviously, that's relative to his peers, but no, I don't think I'm overreacting at all.
He's never been the primary option on offense. You're not going to score a lot on teams that have Westbrook/Durant (or Allen/Pierce/Garnett, for that matter). As small a sample as it is, he did pretty well, scoring-wise, in the games when the Big 3 was out and he was a starter with Rondo running the show.
His defense is better than mediocre. He can stay with most SFs (which has been a question mark). He gets pushed around by some PFs, but is at least an option there at spurts. He's the first thing that comes to mind when you say "lock-down defender", but to me at least he's shown that he can be reliable at the SF position. And he did a credible job on James in the playoffs, which is important since we'll need this in the future.
No, his rebounding or passing is nothing to write home about. No, he's not perfect, and he's not the first guy you'd pick if you were starting a franchise. But he's not someone with mostly mediocre and a couple of poor skills. That's Jiri Welsch.