I think Conor was a great fighter but I think his approach was wrong. IMO, not having any title defences indicates a slight lack of confidence. There is a common belief amoungst MMA and combat sports champions that retaining a title is far more difficult than winning a title. Thats why we see so many fighters (Werdum, Andrade, Alvarez, Holm, Tate, Serra, Rockhold, Shogun, Rashad, Forrest) be able to win a title but are unable to retain it in their first title defense.
I think this is down to the idea that a champion always has more to lose than a contender so that mentally drives a contender and in some cases, can mentally weaken a champion. Its why guys like JBJ, DJ, GSP, Silva and Nunes are considered the GOATS. To continuously defend your belt multiple times is an unbelievable achievement, especially given that all the guys below you are secretly continuously game planning for the moment they face you re-Weidman when he fought Silva, reyes when he fought Jon.
Therefore, given the number of mental disadvantages a champ has compared to a contender, it makes the achievement of defending a belt IMO more impressive than winning two belts without any title defense. This is because you have nothing to lose and everything to gain when you are a contender. Conor has never been in a position, win or lose his fights, whereby he was in the position to lose anything physical i.e. a belt. The only thing that suffered was losses was his reputation but thats the case with all MMA fighters (re- O’Malley, Shahbazyan). Champions are defined by their ability to overcome adversity and there is nothing more difficult to overcome than retaining your belt. Conor in that sense never had to overcome real adversity, certainly not to the same extent as champs defending their title.
I think it would have been interesting to see Conor attempt to defend his 145lb or 155lb belt to see if he had the mental ability of dealing with an individual who tried to take something that was his. Its also why I believe someone like Cejudo has a bigger claim to the GOAT status than Conor. Cejudo not only won two belts but defended both his belts against guys who were in some ways, favoured to beat him i.e. TJ and Cruz. Same with DC and Nunes. Conor never had that mental fortitude of dealing with someone that was coming to take something that belonged to him, so to put him in the GOAT conversation is a bit of a joke