I'm not even close to invested enough in this to go digging through threads from 15 years ago, I'm just adding that my view is similar as Isa's on the subject as the Fedor threads were the biggest source of amusement back then.
I remember that stuff with GSP and Silva too, which was also very exaggerated. As for Fedor, his fans thought there was no one with a better ground game than him in the world and yes, people talked about how he would win ADCC, etc. We also had statements like how good he would do in K1 because he beat Schilt at his own game, despite that anyone that actually saw that fight knew Fedor hardly threw a single punch standing. Fedor was such a deity that just because he was training Kirill Sidelnikov that mediocre guy was heralded as the future MMA king by those fans.
There's been extreme hype about many fighters but I don't see Silva's fans as on the level of Fedor's fan base, and I'm saying that as one that had GSP as one of my favorite fighters and therefor attracted the ire of Silva fans plenty of times. This place has gone insane for many big losses, and Fedor's certainly wasn't any lesser. As for still getting threads, we're still getting threads that Fedor is the best as well. We're in one right now, although of course not a peak level one.