Thanks for asking this question
@Dionysian. It's not asked enough. Most GOAT debates, fans argue over the answer without ever agreeing on the criteria. They're talking past each other - legit "
the answer is 42" sorta shit - and don't even fucking know it.
For me it's:
- Dominance in the era is #1.
- Longevity is #2.
So IMO Benson Henderson (not picking on him, just using an example) cannot be a GOAT candidate because he lacked dominance in his era. He was a) not better than Pettis, and b) barely beat Gil and Edgar.
A GOAT cannot be oh-so-marginally better than multiple other opponents in his era, according to my criteria.
And yes, longevity counts for something. Someone who bounces around like Conor or CCC lacks in this criteria.
So the fun begins when two fighters in the same division wrecked the division for a long period of time. Izzy is coming closer to making that happen at 185. At 170 and 205, the #2 is debatable.