That's an accurate summary. Monzon was lax in his conduct, so destruction was not as obvious, but the right hand crunched and caved in fighters; a sweet shot. When Monzon found his range with his honey punch, stoppages were soon to follow.
I think his style was such that he generally picked his opponents part using an extremely heavy jab, and was fairly judicious about letting his right hand fly with full power until he was certain that he could land it. But, even though he rarely scored early knockouts, he still hit damned hard.
Many have mentioned this before; Carlos would always seem to somewhat lazily bide his time, sticking that jab out, throwing the compact power shots early on, and virtually always had the fight going the way he wanted it after the first few rounds. It always amazed me how he could get fighters out of their usual familiar style and rhythm and make them fight differently against him. And he had a knack for knowing when he had hurt someone, even a little, then started shifting into that higher gear proportionate to how badly he had hurt someone.
I think the more pertinent question would be... How effective of a puncher was Carlos Monzon? Answer: Extremely.
Agreed. And most importantly, he was an all time great finisher. If someone got busted up/swollen/badly hurt against Monzon it was all over and all over quick. He didn't let guys slip thru the cracks and punching power has something to do with that. That would be one hell of a disadvantage to be busted up or badly hurt & Carlos Monzon is the other guy coming out of the corner when that bell rings. I'm not sure the great tough guys that fought under those conditions--like a Lamotta/Basilio/Fullmer could hang in there with King Carlos if they were in that shape.