The reason I think gold would have been the way to go would be because of one of the ride's main selling points: the records it's breaking. The mini-site for the coaster has tabs reading "Visions of Glory" and "Rise to Power," and the records page describes it as the "undisputed king of dive coasters." Themes I see resonating here are domination and victory. Gold and silver are commonly associated with winning and wealth, so they would be very appropriate for a coaster like this. Not like a cheesy cartoony yellowy gold, but like a deep, legit gold.