Off the top of my head, Russell Westbrook. His stat line was not amazing. That said, he was considered a top defensive tweener based on athleticism. I can remember what the videos showed of him, but to half answer the question, mediocre stats are not determinative to the extent that elite athleticism exists IF player development continues in the NBA. If I am agreeing with you, for me, the videos of practice mean nothing to me. But combine stats mean something to me.
Russell Westbrook Stat Summary - UCLA Bruins:
Season GP MPG PPG FG% 3FG% FT% APG RPG BPG SPG
2007-08 39 33.8 12.7 46.5 33.8 71.3 4.3 3.9 0.2 1.6
2006-07 36 9 3.4 45.7 40.9 54.8 0.7 0.8 0 0.4
Career 75 21.9 8.3 46.3 35.3 68.5 2.5 2.4 0.1 1
This would support the Stein campaign, but for me, I am still leaning toward Hezonja.