I'll give him this much, he played better this year than I thought he would. But we (management and coaching staff) can't be content with that and rely on that as some kind of indication that he'll be exceed expectations again next year.
But it's 2019 and players get old. A lot of our favorite and long tenured players (the ones who stuck around long enough) weren't themselves by the end of their time here. Not that they were all terrible, not all of them were Jay Pandolfo or Colin White bad by the end of their time here. Marty, Dano, Randy McKay, Madden and countless others (including the aforementioned White and Pandolfo) weren't really themselves anymore by the end of their time here. I think Scott Stevens and maybe Elias were the two guys who didn't drop off much and even in Stevens case, I think it's safe to say 2003 Scott Stevens wasn't as good as 2000 Scott Stevens.
Even Elias dropped off a bit in his second to last season (last full season here) here, but it wasn't too bad. I think it's fair to say Greene is probably in that territory right now. He's not twilight Daneyko, McKay, Pandolfo or White bad, but I don't think it's an insult to say this 36 year old player that's probably in the last two or three years of his career (he might play one more year after next, but I don't think it should be here) is not nearly what he was in say pre-2015 or so.