Dana has done a lot, but the Fertittas' money is the only reason this sport is around. Dana would be sitting at home if it wasn't for them. Their money upped the production value of the UFC and pretty much did just as much work, if not more than Dana White has done. Dana just gets the credit because its his big mouth on the TV screen.
The Fertitas are nothing but shams. They inherited a ton of blood money from a mafia family and run a shady casino conglomerate.
They only get involved when they feel like overstepping Dana because it's their capital.
Dana is the President of the UFC's day to day operations...period. Nearly everything that the UFC does is a result of his doing....at the very least he has input.
As far as Rampage goes, he's a big baby and has been a mediocre fighter for 3 years now, this is nothing new.