[Mr Rogers]

According to the British Nationality Act of 1948, Barry’s parents could have petitioned to have Barry made a citizen of the UK. He would not be so automatically.

In like manner, Barry’s mom COULD have applied to become a UK citizen - but she did not. After the divorce, it would have been murkier.

[BP2]

Barry’s mom COULD have applied to become a UK citizen

Not a citizen, a British subject, as that's how British nationality law was until 1982.

HOWEVER, it's a moot point.

AGAIN, since you like quoting US v. Ark, does it say to apply TODAY'S citizenship laws OR references used at the time the Constitution was written by the Framers?

“In particular, the Court noted the Constitution's requirement that the President be a “natural-born citizen,”
a condition whose meaning could be derived only by reference to English common law in existence at the time” - Judge John W. Guendelsberger, appointed by Barack Obama to the Board of Immigration Appeals (BIA), referencing US v. Wong Kim Ark (1898), and Minor v. Happersett (1874), in turn.

[BP2]

In like manner, Barry’s mom COULD have applied to become a UK citizen

Perhaps. But he has ALWAYS been a British subject, and always will be.

"Once a British subject, always a British subject"
Regardless of place of birth.
Universal, Irrevocable, and Permanent until death.

If for some reason the US were ever to expel Obama, the UK would be the next logical place for him to seek residency as the UK would always welcome him because of his deceased father's former status.

Under the current Kenyan Constitution, he could reinstate his Kenyan citizenship gained after Dec. 12, 1963.

The same is true for Indonesia, as they now allow Dual Citizenship post-2006. They did NOT honor Dual Citizenship when he was an Indonesian citizen from circa 1966 to 1971, a five-year period which is theoretically a problem in a suit against Obama under Indonesian law there at the time ... but otherwise a distraction from his status of being born as a British subject in the US or elsewhere.