Weakest Eras in Heavyweight History?

Lets start from the bottom and work up.

A journeyman in the 1920s, would be very much like a journeyman today, in terms of his, professional investment, training, and chances against the other categories of fighters. It is not a huge stretch to suggest that the 1920s journeyman would find work today.

If we look at the next couple of categories up, again we would see an approximate match in terms of the fighters level of professional investment in the sport, level of training, and chances relative to the other categories in their own day. It would be a reasonable assumption, that the 20s gatekeeper or fringe contender, would be a class above the modern journeyman simply based on being a full time professional.

While we cannot say that these categories of men are directly equivalent to their modern counterparts, there is a sort of equivalence based on their level of professional investment in the sport.

This is highly implausible.

When you look at a fringe contender from any era, you are looking at a man who clearly does not have the attributes necessary to be champion, and which are found in champion's across all eras.

How many champions have not had truly exceptional qualities of some type?

I can buy into the idea that there are guys who were at contender level, who might have been champion's in another era, but that is as far as I would go.

If anything I suspect that the dynamic works in the opposite direction.

In other words, that the current range of titles and weight classes, make it easier to hold a title than it has ever been in human history!