Well, history has a lot of twists and turns about what an NBC is. The Constitution doesn't define it and court cases have been few and not on point with Obama's or Cruz's case.
This is a situation where a federal court must take an INDIVIDUAL CASE or CONTROVERSY, like they're supposed to (Art III, Sec 2), and apply the best good-faith understanding of the original meaning and purpose of NBC to the case at hand.
And that decision applies ONLY to the case at hand or any other case with the same facts and questions of law. The Constitution never contemplated the Judicial Branch to make national law. The scope of a SCOTUS decision is constitutionally LIMITED to individual cases and controversies (id.).
Minor vs Happersett:
“it was never doubted that all children born in a country of parents who were its citizens became themselves, upon their birth, citizens also. These were natives, or natural-born citizens, as distinguished from aliens or foreigners.”
and the USSC turned down several cases