Nah I disagree with that we don’t have a big enough sample size of top Cubans turned pro young enough. Rigo was almost 33 when he washed Donaire, Ortiz gave Wilder all he could handle at 38 (or older) imagine if he's just 5 years younger.
Lara and Gamboa turned pro when they were 25-26 which is ok but still not the usual, Lara had a pretty good career too and Gamboa unfortunately spiralled out and made bad career decisions like signing with 50 Cent.
I maintain that there would be a lot more Cuban success could they turn pro legally in their early 20s like boxers from other countries can. Most of the Cuban fighters stay in Cuba being amateurs in all their career I think comparative to their small number in pro boxing they made a lot of noise in this decade wheh more of them turned pro than the decades before (I mean after the 50s-60s or so).
I get that you are irritated by the hype but they are still good.
Actually from the schools you listed PR and Michigan does worse than Cuba in these last few years or so even though all of their fighters are free to turn pro so they can represent themselves in greater numbers.
Who's really out there from Michigan now? Tony Harrison and Anthony Dirrell?
How many (US) fighters making noise from Florida right now? Thurman, Lubin, and...?
From PR? Acosta, Pedraza, Dulorme, Machado, Matias...?
Cuba's Rigo, Dorticos, Ortiz, Ugas, Lara, Barrera outmatches any of those other groups I listed all that while Cuba has 46 registered pro and PR has 219 so almost 5X as much. Can't find how many registered boxers Michigan or Florida have but I guess it's more than 46 too.