For the ‘David is a myth’ scenario to be true, all the Ndesadjos’ friends, immediate family, extended family/relatives, neighbors, school teachers, local newspapers, etc., have to be lying or stupid, and there cannot be a single truth-teller/whistle-blower in the entire lot. The odds of that being the case are too long to calculate.
I agree, the odds are against it, that all those people would collude to say that David didn’t exist.