I actually love the idea of a Greaser biker character, fits with the era of the movie, its fun but also kind of hip, and with LaBeuf in the role that gives me confidence that they won't make it too cool, that they will be able to make it lighter and more human, maybe like Paul La Mat's character in American Graffiti (for instance, if they had Orlando Bloom in the role, I'd be worried that it'd be too image-conscious). And it makes for a good contrast like in Last Crusade, I can imagine cranky old Indy not exactly fitting in with a wanna-be-hipster.