Dude that pic is shopped, compare it to other pics taken in the same time frame. In fact there's a thread on CF that discusses that pic, I'm not going to bother looking for it but maybe you want to try to bump it.
He is just skinny AF, people can be skinny. Look how Dwight and Kobe's arms have actual muscle that move away from their arms. yi jianlian is just ripped and vascular with no muscles. Dude is tiny and the picture of him being tiny is not evidence he is on roids.