@Wuiff That's what every single person would assume. And yet, You gonna be disappointed in Roland vs Zero battle unless the mangaka changes it. Nothing of what Roland thinks works, which makes zero sense, at least Gundam should work, and he's a fan of that thing. The author wanted to make this battle tense, for some reason, despite everything pointing out the advantage of Roland. Yes, imagination isn't everything, but there are tons of things that are possible that we just don't know how to make it. I mean, you don't need to actually know how it works, that siege beast, for example, Zero has no idea how it works, or how to make more. A bullet-proof skin? Graphene can make that, we just don't how to produce large quantities of that. The terminator? We know it's possible, the power source is the only thing we aren't sure, the rest can be done. ED 209, sure can be done easily.