They are both discovered and 'created'.
Outside of hardcore fans no one knows Ken is adopted thus he is and was widely considered Irish.
HW boxing went on a 10 year decline in the US in large part because 2 eastern european boxers were at the top not someone from the english speaking world. Then a bum of a boxer with zero pro experience generates $400 million fighting Mayweather, go figure.
Anyway whatever, this type of thing is for those who want to see things as they are and how this show actually works. If you dont then its up to you - enjoy the Mcreggor show I dont want to spoil your fun just ignore what I said.