Like, what do you consider an accomplishment?
khabib
DC
Volk
Jose Aldo
MM
Izzy
Khabib: went undefeated in a super deep division, and participated in the most watched UFC fight of all times, imo most exciting and satisfying fued too. Now his understudy - as im sure they're both into using thetre terms - is of his same mold nd seems to be as dominant.
DC: was the first modern era double champ in heavier weight classes(whilst also being older) ANd excelled in amateur wrestling. the UFC rewarded his company man, work-for-my-paycheck sttitude with a nice gig.
Volk: I dont know right off hand if volk had more FW title defenses, but his first Islam fight and success at it ranks him above Aldo regardless. Plus he is unarguably a bigger draw and star than Aldo. Plus being closer to the current era == more challenge
Aldo: i personally like Aldo a bit more thsn volk and believe - without looking at wiki - he had more defenses, but it seems like the era where that run took place was still in it's infancy. Just being the pioneer isn't a greater accomplishment than being the best to ever do it
MM: people say he's p4p the most skilled MMA fighter ever... but if you're 125 lbs it's just not that impressive to me. What if you found a 5th grader who could beat every other 5th grader in wrestling, ammy boxing, and won every IBJJF yellow belt worlds match, would you crown him the best p4p FIGHTER of all time? his historic run of title defenses, though, make him... not last.
izzy: i wont even try to hide my disdain for this guy. All the non fight attributes associated with him seem fake. Second best middle weight ever, nowhere ner Anderson IMO. But he's rating's draw apparently so that accomplishment should fair higher than MM cleaning out the almost embarrassingly small men's division.