You're not following me. Rubio's situation would let a person born legally in the US but with not citizen parents be president. Cruz's situation would let a person not born in the USA with only one citizen parent be president. Put the two situations together, and a person could be not born in the USA and have no citizen parents and still be president. Obama's situation allowed a person born in the USA with only one citizen parent (even though that parent wasn't yet 21) be president. Put it all together, and it sure does look like an invisible hand is guiding us to no requirements except US citizen to be president.
It's not a "strawman" argument. It's a logical consequence of a combination of hypotheses.