You are missing the point that a citizen and a natural born citizen are two separate entities. The latter is REQUIRED to be president and command in chief. Cruz is not natural born.
I’m not missing anything-
Some debate exists as to the meaning of this phrase. Consensus exists that anyone born on U.S. soil is a -natural born Citizen.- One may also be a -natural born Citizen- if, despite a birth on foreign soil, U.S. citizenship immediately passes from the person’s parents.
https://www.law.cornell.edu/wex/natural_born_citizen
That’s the whole point of this issue- the meaning of natural born- and even legal scholars don’t agree on what it means- however the consensus leans towards the above-