It's just sad to see when educated fans insist on shitting on legends. I'm not saying that Penn is the best lightweight ever, but he wiped out the best of the best in his time, before he ran into Edgar. He smoked Hughes who was basically unbeatable at the time, and he gave GSP hell. That doesn't go away just because he continued for waaay too long. I'm sure Penn is hurting his legacy, which is a shame, but he can't destroy it. RJJ kept taking losses until pretty recently in boxing, but still, nobody could touch that man in his day.
RDA had an amazing run, and what Tony and Khabib are doing right now are truly historic, because the sport has gotten so much better with time. Their streaks are so impressive exactly because everything has evolved. So, last man standing between the elite lightweights right now should take the GOAT claim, but let's wait with all that talk until the dust has settled. Poirier is doing some amazing shit of his own. He's for sure the underdog with Khabib, but I wouldn't count him out. This is just a great time as a fan, because the sport is much better than 10 years ago. Let's celebrate that instead of shitting on the legends who paved the way.