You said and I quote “what heavyweight do you know that didn’t fade after 10 years”. I’d say that the fighters listed above are doing just fine being in the top 10 and MUCH OLDER THAN FEDOR while majority fought for 10 years plus competed in an alternate martial art/combat sport…especially the #1 and #2 guy. So what is your excuse now? He didn’t take much damage during his career and started losing at a youngish age.
Stop with your bullshit leading questions like "what is your excuse now"? Don't fucking try to lead me because your argument stinks. Those fighters are only doing decent because they're fighting each other; what is so hard to understand about that?
Let's look at how "well" they're doing. Barnett got beat horribly by Travis Browne, who's a complete joke, and has only fought 4 times in the last 4 years, with 2 wins over over-the-hill Arlovski and Roy Nelson who was 3-7 before he got cut; he's faded as hell despite the steroids which he just got caught using yet again for the 4th time a year ago and hasn't fought since; that's not doing well.
Rothwell was doing decently ok against other older guys like Overeem and Barnett, with a good win over Mitrione, yet was only fighting 1.2 times per year on average for the last 8 years and just got popped for steroids yet again; that's not doing well. To put this in perspective, Fedor was fighting 3.25 times a year on average for over 12 years before his retirement and then later return. Rothwell may have started out actively when he was fighting regional-level bums, but Fedor was even more active while fighting the top 10 for over 10 years.
JDS just failed a drug test under USADA, was 3-4 over the last 5 years and looked atrocious against Stipe; that's not doing well.
*All 3 of those guys have been removed from UFC rankings because of their cheating.
Hunt just got beat down by a guy who hadn't fought in 5 years, and his only wins in the last 4 years were against old bums like Mir and Bigfoot Silva, and wins over mid-level talent in Roy Nelson and Derrick Lewis; he's 4-4-1, that's not doing well.
Cain has only fought 1 single member of the current top 10, in which he lost to Werdum, two years ago, didn't fight for another year when he beat fringe #14 Travis Browne, and hasn't fought in a year and a half. Was deemed fucking medically unfit to fight a year ago due to bone spurts in his back. Has fought only 3 times in 4 years, and when he was fighting somewhat regularly, he fought the same 2 guys over a period of 4 whole years. In 10 years has fought the same amount of fights that Fedor had in just 3 years. That's not doing well.
Overeem is doing pretty well; years of steroid use will definitely lengthen your career. Even then, his wins are coming against those faded guys like Hunt, JDS, Roy Nelson, Arlovski, mid-level talent like Struve and his one good win against Werdum. Let's not pretend he's anything like Ubereem.
Werdum is doing very well. That will happen when you fight at half the rate of people like Fedor. As I stated, he's 15 years into his career and has fought as much as Fedor did in 8 years. His last two opponents, however, were nobodies, one being a last minute replacement, Walt Harris, a mid-level guy with a 4-6 UFC record. Tybura is only ranked #8 because Barnett, Rothwell and JDS all popped for steroids, bumping him up.
Stipe is also doing very well. Again, that will happen when you fight at half the rate of people like Fedor, and when you're fighting over-the-hill competition. He's the king of an immensely weak Heavyweight division with no future contenders other than Ngannou lined up. Minakov is a decent contender but is out fucking around in Russia fighting bums. Stipe fought a couple amateur bouts in 2006-08 then nothing for 2 years before turning pro, so don't pretend he's been active for 10 years. Fedor was fighting ADCC champions and future top 3 guys by his 4th fight, that's not some amateur hobbyist bullshit.
Again, you don't seem to grasp how fight years work. If I fought once in 2008 then once again in 2018, that doesn't mean I've been actively training and fighting for 10 years.