I think that's the case for most era's though, you have one or two genuinely good/great guys rest are the best older guys of previous era, maybe a couple of decent contenders from this era and rest are mediocre. If you get 4 guys or more like in the 70's or 90's that are good/great and a few decent contenders then you have a very strong era. Even when I look at the prospects coming up now I don't foresee a particularly strong era several years from now when Joshua, Fury, Whyte, Usyk etc are all retired. Guys that lived through both the 70's and 90's era are lucky, I just hope I get to see another strong era at heavyweight once or twice more in my lifetime.
Not a strong era by any means but looking back on eras they tend to get overrated a bit. For example people would list the 10 best fighters of the entire 70s but if you looked at a year by year list there is probably 5 or so guys ranked in the top 10 who arent great fighters.
Yeah that's true, people expect the top 10 to be loaded by quality fighters because well it's the top 10, but the reality as you say it's usually just a few quality guys. Honestly being top 10 isn't all that, plenty of guys break into the top 10 for a while that are simply not that good, Seldon, Stiverne, Martin, Peter etc, there are countless fighters who fall into this category. It's those that can stay in the top 10 for most of their careers, guys like Povetkin, that's the sign of a quality fighter.
Eras are strong or weak depending on whether guys with relative parity fight each other and put on great matches. If Joshua and Fury set it off, Usyk pans out at heavy, Ruiz gets in shape and conributes, 1-3 of the prospects pan out...this will be remembered as a great era. Given how things have worked out in about the last twenty years or so, I am not optimistic.