You're saying a car that's 1 inch narrower somehow wouldn't fit the same roads?
None of those things would work.
Besides, creating minor differences do not solve this problem as they would still be derivative works.
Your question is exactly my point. I'm suggesting what I said earlier:
>> I don't think that's a good analogy at all.
But sure, if you say so.
It's possible to extend any analogy in a way that doesn't make sense, which is what you've done.
It seems like your complaint may be that you simply don't like, or perhaps don't understand, analogies in general.