Look at the fighters that gave Conor the hardest fights (Holloway, Mendes and Diaz). What was the one thing they all had in common? Short notice. Conor strongest attribute is his intelligence and ability to pick up on one's natural patterns etc. The greatest fighter he fought was Aldo and we all saw what happened when he had a year to prep. Conor is much more a cerebral fighter than physical grinder.
Also, the hardest thing to do is properly go up in weight in a short period of time. Conor should have fought at 155 but his belief in himself superceeded common sense. Even fighters like Cruz said he feels like S if he doesn't cut some weight. This was Conor's first fight ever where he didn't cut weight and lacked all prior fight preparations that he had before and it showed. Before the punch, Conor lost all movement, was flat footed, gassed and standing squarely in front of Diaz. Prior to Aldo, he was calm, quiet and prior to Diaz, he was trying to hard to hype the fight and couldn't get his pre fight zen on, the calm that allowed him to take more damage from Mendes and storm forward and KO him.
Technique did not fail him. His gas tank did. Infact, when he wasn't gassed, he was having his way with Diaz (not disputable) Not saying he will win but it DEFINITELY warrants a rematch and the first fight was awesome. If the fight were originally at 45 or even 55, I'd see case for no rematch but Conor went up two weight classes in 3 months; something no other UFC fighter has done in history and with good reason. We should reward fighters for taking risks, saving cards and not rake them over the coals. The well rounded cerebral fighter that we saw vs Holloway turned into a prophetic global rockstar that was looking to out do all his previously absurdly lofty achievements and should have been fine w/ just a W.