The immediate reason is that if you've watched Kobe and Iverson play, you can clearly feel the gap in coordination and fluidity of ball handling between them and others.
The reason it's hard to bridge is...
This trait is basically impossible to improve significantly through effort alone.
Regardless of past or present, when Biedrins is off-ball, he is a highly mobile big man on the court.
In the future, he will block Duncan consecutively, single-handedly defend Nowitzki, and even expand to the perimeter to guard opposing backcourt players when necessary.
But once Biedrins has the ball on the court...
He immediately gives you a sense of dissonance.
This dissonance is most prominent when he shoots.
In Qin Yue's memory, Biedrins's high mobility was precisely what earned him that 6-year, 64 million US Dollar contract under old Nelson's tactical system.
And then...
There was nothing after that.
