At the post fight presser he said he did the best he could with what he had to work with. That's actually an interesting point.
GSP isn't just one guy, He has an entire crew around him finetuning him like a machine and making sure he doesn't have any worries about things like nutricion, schedules, money, transportation, trainingpartners etc etc. all specifically catered towards him. Everything is taken care of for him. There must be around 30-35 people behind the curtains. All this obviously has to do with budget.
You could wonder if the average WW could ever compete with those kind of resources?
btw not taking anything away from his abilities ofcourse, inside the octagon it's still only one man !