Hmmmmmmmm,
Thats interesting. A lot of Nigerians seem to be going to South Africa at the moment and are returning to Nigeria with their SA CPL (This is due to the visa restrictions and price). I will say 50% of the Nigerians new CPL holders are from SA.
Infact, the youngest female Airline Pilot in Africa ever as reported by CNN (Nigerian) graduated from South Africa and her younger sister is about doing the same (I think trying to break the record or something).
My point is that, they dont have to be Nigerians not to like aviation or be a slow starter, am sure another instructor from somewhere will probably say the same about some SA Nationals under training.
Regards
DMan