I think a common complaint a lot of people have with a lot of fighters post 1990 is punching technique. A great part of that is leveraging your whole body, foot to fist, to generate the snappiest and most concise punches using proper weight transfer and body mechanics. While I think there are some fighters who do an exceptional job of this in the game even right now(Marquez, Mayweather, Donaire).... It's certainly something that I think many top level fighters suffer from because they don't apply it consistently (Alexander, Broner, Khan). Who would you tell them to watch, from eras new and old, as an example of putting proper CONSISTENT leverage on punches for a whole fight?
For the 90s i think of Jones, Trinidad, Lopez at their best. Carbajal doesn't get enough credit for how good he was at this
Chocolatito's ability to do so (especially for a smaller guy) is part of what makes many of us see him as such a throwback. He doesn't always, but when he does - yowza. His right uppercut in particular seems to well up from deep in the mantle of the earth.
I don't quite understand the Mayweather example. Obviously the guy in my avatar. For more modern examples, I'd say Ward may seem like a weird mention. I think he tries to put good leverage on his opposition on the inside, but just isn't much of power puncher. Cotto at JR WW might be a better example.
You don't think he gets significant leverage on his straight right hand? (counter or lead) It's hardly a slap or an arm punch when he throws it, now is it? I'd accept that he rarely gets as much of his full weight behind anything with his left (although the jab is crisp enough for a flicked pot-shot/space-saver, and the hook usually solid) but you've gotta respect that SRH. That thing has deep roots.