Reef has not played particularly well this year, and by his own standards (not mine) has pretty much sucked. One of if not his worst years.
Now I don't think that's all about him, as the team is unbalanced. But 16pts 6rebs is pretty weak, and there are 50 guys in the league who could do that for you. Theoretically there should be no comparison between he and a Kenny Thomas level player, but Kenny as a starter is 13.1pts 9.7rebs and very much in the ballpark. And unfortunately the ballpark is titled " Lottery Starting PF".
"Efficient" can be another way of saying "ineffectual". And much like Peja, you have to wonder if he still has it. Or really if he ever had it. Early in his career he drew a lot of oohs and aahs with the pretty spinning post game. But he never won anything, and may never have had the spark. And its been years since he mattered at even that level. Been in the league a long time. Might be wearing down, mentally or physically. Either way, not an impact player at this point.