- Anderson Silva has had at least as many, if not twice as much losses as GSP, when comparing their primes (or versions of them were they are still close to it). He also struggled against competent wrestlers, which to me is important, because wrestlers are one of the most common fighter types in MMA. Him popping doesn't play as much of a role as it does for Jones though, as Silva's prime years all were pre-USADA.
- Jon Jones has popped multiple times (post-USADA), fought in a division which hasn't got the same talent pool as 170 or 145 and very rarely fought opponents that were naturally equal to him in size - when he did, he struggled heavily two out of three times (Gus I + Reyes, against who he lost in the eyes of many.)
- Georges St-Pierre had a close fight with Hendricks and (got) greased against BJ Penn.
- Fedor Emelianenko fought in a division which was (very) stacked for its standards, but still not comparable to weightclasses in the "normal" range (145-170) and fought some sub-par fighters in between.
- Demetrious Johnson should have one more loss (it was a judges mistake when the fight against McCall was judged as a MD, IIRC) and fought in a weightclass which isn't as stacked as 145-170 either, although it's far more stacked than people realize, arguably as stacked, if not more stacked than 205, for example.
- Jose Aldo had this phishy incident where he spilled the urine-test, got finished in his absolute prime (McGregor) and twice close to his prime by Max Holloway.
See? We can do this for literally anyone out of these guys.
Doesn't mean that (in the case of this thread) Georges St-Pierre isn't a very legitimate contender for being the greatest fighter of all time.
I do by the way think it's between Demetrious Johnson and Georges St-Pierre, but Emelianenko and Aldo are fine too, especially because Aldo fought by far the best opponents, skill-wise.
It shouldn't be controversial to name Anderson Silva or Jon Jones as the G.O.A.T. either, although i disagree with these choices.