At the very least it will be a long while before anyone comes close to the sheer length of Fedors win streak, you could even argue no one will ever surpass it due to how MMA matching has changed. Fedor has around 10-12 very good wins, while the rest are padding to an extent against lower level competition as compared to todays standards. He was also a very special athlete with a tough upbringing in 1990's Russia, which experienced the sharpest decline in life expectancy during peacetime in recorded history after the dissolvement of the Soviet Union during that decade.
He once said early in his career that every time he fought he thought of his family and the struggles he went through, and that the man across from him was going to take food out of his family's mouth, and he wouldn't let that happen.
He trained with tires with his brother outside or in parks, not fancy gyms and PI institutes.
He had great respect and sportsmanship but was also a cold killer. His speed at HW is still unmatched although some are close.
He also fought in an org with a ruleset that today's premier org [UFC] doesn't use, and fought in Grand Prix's.
So suffice to say he was a rare and special talent from a specific time in history.
BUT I voted Fedor, because Aspinall while not being as impressive is CLOSE in terms of athletic ability and speed as well as power, and I do think we are starting to see new breeds of HW's.
Ciryl Gane is nothing compared to Fedor obviously, BUT if someone like Cyril Gane trained at a young age and was motivated, hungry, and special, they'd reach near Fedor heights.
Meanwhile LHW is at an all time low even more so then HW, Potan has no one but Ankalaev to face. Potan himself is representative of this decline, a very limited Kick boxing champion with very few MMA fights coming in and dominating.
Even more so then the HW division, LHW just isn't elite enough for a Jon Jones like run. In Fedors time the cream of the crop at HW was more elite then today, but the vast majority of HW's were still brawlers, fat guys etc. LHW was killers all the way down though just before and during Jone's peak. In Jone's era and division you had to be much more of a complete fighter, And Jon Jones is perhaps the most complete fighter of all time.
Lastly Jones had the ability to be much more unorthodox then someone like Fedor. Unorthodox high level fighters are extremely rare, especially in the modern era.
Additionally LHW fights last longer, there's more technique involved, there's more ways to lose .
Yes in HW it's the power, title runs are very short usually, but that also means you can win quick, and if a guy has the speed of Fedor (or close to it) you could absolutely go on a tear against these guys.
I don't think you'll ever quite get someone with the win streak of either in our lifetimes, but you'll see a legendary fighter like Fedor at HW (Aspinall, a Ciryl Gane clone 2.0 ) before you will see a crazy unorthodox talent like Jon Jones at LHW. The man would party with cocaine and then a week later beat a guy like DC, fighters like that are ultra rare.
