When he fought them, they were elite. Go back and check the rankings of those fighters he fought and beat when they fought, you'll see that they're consistently top 10. Just because they weren't in the UFC, doesn't mean that they weren't elite. Fedor never fought for a UFC title, is he not elite? How about Gomi? Seriously, go back and check the rankings of fighters that he fought WHEN he fought them. Not to mention, this is LW we're talking about, arguably the most stacked division in MMA for more than a decade. The top 10 has been a revolving door in this division (all of MMA, not just UFC) for a long, long time. I don't think anyone has spent more time on that list than Alvarez.
Fedor is from a different era than Eddie Alvarez.
Fedor fought the best guys in the top MMA organization at the time which was Pride.
Alvarez always fought in the B leagues.