Probably because most of B.Husein's facial features, as oppossed to his skin tone and eye color, are more akin to those of his maternal grandfather than any of the others, including Malcom X.
Any black dude could have supplied the skin tone, hair color and slightly broader nose and fuller lips. Any black dude.
Have you looked at BHO Sr or Frank Marshal Davis?
Check for a vertical mark on the upper lips... you’ll see Barry inherited his upper lip from his father Frank Marshall Davis, not from Obama Sr.
If you put Stanley Ann’s huge jayleno chin on Frank’s receded chin, you get Barry’s chin.
Agree that the rest of his facial featurs look most like Stanley Armour Dunham’s...
Not even close. BHO could be green and MX pink, but they match each other on eyes, teeth, nose, cheeks, hairline, chin, and to a lesser extent, ears, than anyone else in the Obamna/Dunham household.