Yes, I have been wondering about him too. He was originally scheduled in some Diamond League meets, but no showed. It must be an injury.
In terms of just numbers, Asians have passed up Caucasians in terms of the 100. They have more sub 10 performers and a faster top time. Of course, they don't have to contend with caste psychology, i.e., evil white men, slavery, holocaust, slaughter of native Americans, institutional racism, etc., etc.
Bingtian Su 9.91
Xie Zhenye 9.97
Yoshihide Kiryu 9.98
Yuki Koike 9.98