Funny that all the posters that have a good grasp of MMA and the history of the sport say the same thing. Fedor is without even a debate clear GOAT. Then you have the ones that kind of know a bit but started watching only the UFC and say Gsp or Silva. Then you have the spastics that dont take into account cheating, favouritism and only wiki search and will say Jones. Then you have Conor fans.
Also funny shit about Hendo was actually bigger than Fedor and who stopped the fight to suit Zuffa?! Yep Herb the most dodgiest cunt in the game Dean. lol at the yanks that spew that shit being real are 100% pro wrestling fans.
While i partially agree, i have to say i think that Fedor is not necessarily the clear GOAT as you or others are saying, although i share your opinion, that he's probably the GOAT or at least the closest fighter to another GOAT.
While extremely dominant over a long period of time, he fought in a division with a rather small talentpool and during a relatively early era and quite a few of his numerous wins during his legendary run were against opponents that were not exactly elite, to say the least.
I will say this though: even without these wins, his streak was extremely long and impressive and the fact that he was a rather small heavyweight adds to that.
I think though that St-Pierre is on the same "GOAT-level", while he has not had as many wins during his prime and not as long of a win-streak, it's undoubtedly the case that welterweight (back then) had arguably the largest talentpool - it basically was the weightclass where average-sized men fought and he has fought better opponents on average as well (judged by their record) although the 5-7 very best wins of Fedor and those of St-Pierre are closer.
I with you not putting Jones up there - it's not just that he has popped, but when; a positive test will always put an asterisk besides your legacy, but if it happens during the era with the most stringent drug-testing yet, that asterisk is even bigger, in my opinion.
Then you've got Demetrious Johnson, who fought in a division which was far from stacked, but he was absurdly dominant at most times and not just that; in terms of skill and well-roundedness he was super close to the blue-print of the perfect MMA-fighter, probably more so than St-Pierre etc.
Silva has popped and while super dominant for a sustaibed period of time, he has proven to be susceptible to proficient offensive wrestlers and while he was 38 (or 37?) years old when he finally lost again, there's not much to suggest he'd have done much different against Weidman when he was younger.
Last but not least is Aldo, who - like St-Pierre and Fedor has never popped and just like them was extremely dominant for a long, long time and who still proves to be a top fighter against elite-competition to this day, although i'd probably put him behind Fedor, St-Pierres and DJ.