Conor is a boss for fighting 25# over his weight class, not canceling the main event, and giving the crowed a fight they want to see, not many champions would risk that.
How do you know they were pounds apart on fight night?
It defiantly matters if one guy is 20% body fat at 170, and the other is 7%, or one 5'9" with 74" reach, and the other is 6'0" with a 76" reach, or ones hold 30 pounds of water, and the others holding 15.
Nate just beat the best in the world at 145#. If weigh-in weight doesn't matter, wouldn't he just go down to 145# and fight the Edgar - Aldo winner, and become a world champion? Unless of course Nate to humble for the fame, fortune, and prestige that goes along with being a champion... All Nate did was beat up a small little game leprechaun.
I suggests you check out the nootropic section of the forum.