Here are Aminu's ESPN adjusted +/- for the past 5 years
+2.00
+1.27
+1.73
+2.67
+1.06
I know many of you probably think ESPN +/- is a crap stat. But you're wrong. It's the best single stat available so long as you take if over a long period of time (at least 3 seasons). It's simply a measure of "how much did my team outscore the opponent" when player X was on the floor, taking into account who he was playing with and who he was playing against.
The primary problem with this stat it has very high variance. A month of adjusted +/- is worthless. A single season is not super reliable. A single season of adjusted +/- is similar to judging a player's FT ability by looking his % after 30 free throws. Usually that will be a pretty good measure, but a 65% FT shooter might go 25/30 while a 90% FT shooter also might go 24/30. Not likely but possible. So you really need to look at at least 3 seasons of +/-.
Just to give you a benchmark, a +2.00 player is hard to come by. +2.00 is a top 60 player in the NBA.
Meanwhile here are Evan Turner's adjusted +/- for the past five seasons:
-3.15
-2.89
-1.61
-1.37
-2.79
Is the question really if we should play ET instead of AFA? I don't disagree with your plus minus analysis, but most years, that puts Aminu in the 12-17 ranking of power forwards. I think most of us would like to see someone who might crack the top half more routinely. Maybe even take some painful losses by playing someone who might end up in the top half a year or so from now. Aminu won't likely do that.
For this year (unscientific)
1
Anthony Davis NO 16 37.4 2.79 3.00 5.79 3.59
2
Giannis Antetokounmpo MIL 18 33.4 2.23 2.31 4.54 3.10
3
Pascal Siakam TOR 21 29.1 2.01 2.32 4.33 3.02
4
Nemanja Bjelica SAC 20 24.6 1.31 2.75 4.06 2.33
5
Domantas Sabonis IND 18 24.7 1.46 1.78 3.24 1.74
6
Dwight Powell DAL 15 15.9 0.68 2.54 3.22 0.95
7
Paul Millsap DEN 20 26.5 0.22 2.85 3.07 2.06
8
Montrezl Harrell LAC 19 25.6 1.53 1.40 2.93 1.87
9
Mason Plumlee DEN 20 17.0 -0.21 3.09 2.88 1.24
10
Noah Vonleh NY 21 25.2 0.01 2.78 2.79 2.02
11
Blake Griffin DET 17 36.3 1.66 0.86 2.52 2.22
12
Nikola Mirotic NO 18 31.5 1.97 0.34 2.31 2.13
13
Draymond Green GS 13 30.5 -0.96 2.75 1.79 1.25
14
Serge Ibaka TOR 20 26.6 -0.10 1.70 1.60 1.65
15
Taj Gibson MIN 20 26.4 0.38 1.21 1.59 1.59
16
Ed Davis BKN 21 17.0 -0.42 1.91 1.49 0.97
17
Derrick Favors UTAH 19 23.1 -0.27 1.66 1.39 1.29
18
Swish3 POR 17 12.3 0.31 0.98 1.29 0.54