I'd really never thought about this ...

.
... but the possibility boggles the mind:

Had Miller been a defendant truly interested in asserting a defense of his rights he might have brought examples of, or an argument justifying the use of a short barreled shotgun in combat (like the kind used in WWI for trench clearing.) In which it is conceivable that Miller might have turned out to be the case that overturned the NFA as an affront to the Second Amendment.

Yeah, it would have been nice if Miller had actually had representation. But what might have been nicer is that if the court had refused to rule until both sides could be represented.

pm