I had the Castillo 1 fight a 6-6 draw but could easily see it 7-5 either way. I think that's the only disputable decision on Floyd's record.
To go 18 years without a loss in unbelievable on the world stage, considering all the killers that are out there, and all the crazy shit that can happen in a fight (cuts, injuries, bad decisions, ect).
It's skill, but it's also luck. The judges could have easily given the fight to Castillo. The judges could have given the fight to De La Hoya or Maidana (not that I think they won, but worse scorecards have been given).