No.
This isn’t about his mother renouncing or losing her citizenship. The point is that she was only 18 when he was born, too young to have met the “5 years after age 16” requirement.
I didn’t write the law, just citing it.
As you your point 3, yes. If any of this interesting speculation is true, the Republicans probably are sitting on proof till September.
Frankly, while I find this sorta fun, old Barry has more critical vulnerabilities that McCain and company should spotlight.