I've put up a post on Reddit about some of the Afghan talents coming through, but it's poor practice to copy-paste it here wholesale so this post is a link instead.
Some key quotes:
Some key quotes:
So how exactly do these bowlers do what they do? What makes them remarkable? In Rashid's case, he is a leg-spinner who doesn't really bowl leg-spin. His stock ball is a googly, which takes some getting used to but is not in itself unique. What is unusual is the pace at which Rashid bowls which, coupled with the fact that his whippy, shoulder-dipping action makes it very difficult to distinguish the leg-break from the googly, means that there is not enough time to play him off the pitch.
In Mujeeb's case, I believe that the trick to his bowling is found in his grip. His orthodox, hard-spun off-spinner is bowled with a reasonably traditional grip between the index and middle finger. His main variation is still an off-break, but gripped in a similar manner to Dainty Ironmonger, who was missing his index finger below the knuckle. By gripping the ball with only this part of the index finger, the bowler can still impart spin, but the ball comes out slower and with more flight, despite the arm speed and grip appearing from the batsman's end to be identical.
Most likely, he has learned it by trying stuff out and finding that it worked.
This is in marked contrast to how talent is developed elsewhere in the world. Take the ongoing Ashes series for example: England have tried both Jake Ball and Craig Overton who appear to me to be basically the same bowler; certainly cut from the same coaching manual.