I have read and studied enough on this point that I think I can qualify to give as authoritative opinion as exists.
That almost everyone born on US soil is a natural born citizen (yes, that includes Obama) is SETTLED LAW. There is a very good reason why the US Supreme Court has steadfastly refused to review any of the Obama cases that have reached them. It's settled. Children born on US soil are natural born citizens. Their parents' citizenship DOES NOT MATTER.
Legally speaking, Ted Cruz's case is SLIGHTLY more iffy, as there does not seem to have ever been a clear and explicit decision. But the entire weight of legal opinion seems to be that "natural born citizen" is equivalent to "US citizen at or by birth."
Therefore it seems very, very likely that if Ted Cruz were to run and be elected President, he would be declared to meet the Constitutional qualification as well.
Or, to put it more simply: Yes, almost certainly, Ted Cruz is a natural born citizen.
I disagree. As you keep proffering a demonstrably wrong interpretation, you have NOT read enough to give an authoritative opinion. You are just expressing the popular fallacy.