I agree with you. Obama’s real father was Frank Marshall Davis and all of the mystery was created to hide that fact. The Kenyan was a convenient way to legitimize Barry’s birth. He was born in Hawaii.
If Frank Marshall Davis is Obama’s real father then Obama is a natural born citizen. Frank Marshall Davis was born in Arkansas City, Kansas and Stanley Ann Dunham was born in Wichita, Kansas. It wouldn’t matter if Obama was born in Kenya because both parents would be US. Citizens.