Speaking only to these points, Fedor has the 2nd most top wins in HW history (Nog is first), and peaks/primes are generally associated with the quantity of fights (which in turn has some correlation to chronological age but certainly not in all cases).
To that end, Fedor had 34 fights (and associated training camps) on the books at age 34.
DC has 25 at age 40.
This is also stacking those 34 fights on top of a competitive career in Sombo and even Judo earlier in his adult life. He had tons of mileage on his body.
The absolute peak version of Fedor was probably Nog 2 (the second full fight) at end of 2004. The last fight where a reasonable fan could connect Fedor to "prime Fedor" was the Big Tim fight in mid-2008.
Clearly you think Fedor is an all-time great. I don't necessarily think otherwise, but I question it.
First of all you are counting aggregate "wins". Why is that some amazing stat?
Okay then is Donald Cerrone an all-time great? He has 23 wins in the UFC. That's the most all-time. Maia has the 2nd most, and Jim Miller is tied for 3rd most with Bisping and GSP. Jon Jones is 4th and Diego Sanchez is one of the guys tied for 5th most wins in the UFC.
Wins outside of the UFC are generally irrelevant. Yes I realize there are exceptions like Pride which I acknowledge, and Strikeforce and some Bellator, WEC obviously, but at this point in time it's really just UFC and a touch of Bellator. You are counting a win in some obscure Russian org in a ring over a (thought to be washed) glass chin Arlovski at the time.
I'd count that win because Arlovski is a legit opponent and did some stuff in the UFC after that, but why is Fedor's "prime" arbitrarily stopped there? Because he was undefeated to that point? Why was he not at his prime at age 33-34 which is right around the average age of the top 10 HWs right now, actually very slightly younger. Why was he not in his prime? because he fought legit competition and lost?
I understand you probably are a big Fedor guy, but it's just comical the level the competition he fought at times. Big Nog is legit but how good was he really back in 2001-2006 or ever, and that's his best win. Was Randle really that good? He was a very strong one dimensional wrestler basically. He lost to all the good UFC fighters in the early era and beat the decent ones or ones who couldn't wrestle.
Randleman had an 8-5 record from his first UFC fight up until the Fedor fight and he crushed some cans along the way. He lost to Sakuraba prior to fighting Fedor at HW.
Here's my issue, name the top 5 fighters Fedor has beaten in his career. Please do, the list of names is going to be very weak. Maybe he was past his prime during Strikeforce but even then he lost to a MW/LHW Henderson who was also past his prime. He lost 3 straight, one to a guy who isn't even that good albeit juiced, and one to a good not amazing HW in Werdum.
I think Fedor is one of the best HWs of all time but at the same time anyone who is being objective can see that his record is padded with a bunch of cans / lesser fighters / one dimensional fighters, and I believe if DC for example or perhaps other HWs fought that level of competition the narrative would be different.
Fedor has the Rickson / Royce effect, he has the aura of nostalgia and mystique. I don't think he's actually as good as many diehard fans think he is, that's all. He fought in an era where there were a ton of rudimentary games and he fought a ton of cans in Pride, he did.