Exactly so. Because Bloodline citizenship and ius soli citizenship both are granted at birth, everyone has confused the two as the same thing and as having the same legal ramifications, even though that assumption is not legally or historically justified. Both are citizens, but the Constitution never defines which are natural born. Thus both of these types of citizenship can be called native born, but not necessarily natural born. That is why the judges can use the terms interchangeably in their decisions. All NBCs are native born, but not all born citizens are necessarily natural born. The Supreme Court must settle the question.
The U.S. Department of State Foreign Affairs manual affirms that idea more than anything else for me. It states that while a person born abroad to two U.S. citizen parents is a citizen at birth (non-naturalized) that he or she may not be a natural born citizen according to the Constitution and therefore eligible for the presidency. They specifically make the point that the courts have never ruled definitely on the issue.