What's holding Biyombo back? 

September, 3, 2013
9/03/13
1:44
PM ET
When Bismack Biyombo was drafted No. 7 overall in 2011, it was a calculated gamble and everybody knew it at the time. He could boom or he could bust. Which would he do? That was the question.

Two years into his NBA career, the big man out of Congo has looked a lot more like the latter, and there are several reasons why.