There have been quite a few left arm seamers that South Asia have produced during the last one hundred years, but if one pops the question who have been the most successful down the line, many a pundit would prune the number down to just two --- Wasim Akram from Pakistan and Chaminda Vaas from Sri Lanka.
I was wondering how to explain it. Then I wondered if monkey-see-monkey-do would foot the bill. Eureka! I had hit the correct note. Wikipedia says: ‘Monkey see, monkey do is a saying that originated in Jamaica in the early 18th century and popped up in American culture in the early 1920s.