You’re right that he would be an American citizen no matter where he was born because his mother was an American citizen. There is a question whether he would be a “natural born citizen” if he was born outside the US or a US protectorate (and some other exceptions). If he was in fact born in Kenya, he would still be a US citizen. His parents would have taken rediculous steps to plan and prove his Hawaii birth for absolutely no other reason than they planned on him being a candidate for president. No other reason. An absolutely rediculous idea.