Here's the vid of the meet where Tebogo crushed that 9.91, with Nkrumie coming in for silver.
These top 3 guys, Tebogo, Nkrumie, and maybe especially Boonson, who is super-young, are interesting to follow. Clearly Tebogo is in the lead, but the others are coming. Crap start by Boonson in the final. He will be coming for Nkrumie, who really needs to improve his maintenance and race distribution.
Letsile Tebogo Destroys 100m World Record - The Most Talented Junior Race in History - YouTube