I suspect, there are hundreds of Heavyweights, who have passed through the top-10 ratings, since Primo's time. I also suspect that the majority of them could fair well against Carnera. In addition to this, there are probably quite a number, who were never quite recognized in the ratings, but could beat Carnera, too. Carnera fared reasonably, with a little help, in an era when the average weight of a Heavyweight was less than 200lbs. Even then, he was beaten by capable men of that kind of size. From a cross-era perspective, his advantages would diminish over time and, in terms of his capability, outside of bringing his size advantage to bear, he just really wasn't that good.
I don't see, how anyone could possibly know, how much the average HW weighed in the 1930s! But if we look at The Ring's EOY rankings, we find 53 different men listed in their Top-10 during that decade: The Ring Magazine's Annual Ratings: Heavyweight--1930s - BoxRec Of these, 40 weighed under 200 lbs (using their last bout, from the first year they appeared in the rankings).
Yeah, it won't tell us anything about the average weight, but it's better than nothing. I will try to make some calculation when I find enough time in near future, but this week is very busy.
Both fought well. Was a fun fight (hated the camera work though). Didn’t do much for the Ruiz myth but he looked Sharp despite his early knock down. Still needs to lose another twenty pounds or so.