You've fallen into the first trap of videogame movies there:

"You pre-ordered that thing? You're braver than I thought."

Originally referred to as the "No Nude Ferrigno" Law, today it's more commonly called the Big Green Junk Directive within game development and comic circles, in that never, ever shall there be.

Easy, Stan and Jack didn't want to flash a green (grey) shlong...everytime he changed size!