Are the styles of the popular Okinawan Karate really the same

[island cyclist]

I just saw a history of the styles of Karate in Okinawa and it seems like there is basically only 3 styles. Any of you active in the practice/study of karate?
I think with people now not getting visas to study karate, the dojo are probably focused on kids these days from the military and Okinawans?

 

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