On point 1, you're producing an original theory (WP:OR).  On point 2, you're asserting, without in undisputable source, that this constitutes a retcon which applies to everything that's come before it and after it (again, WP:OR).  On point 5, you're just wrong: the BBC has never taken a stance on what constitutes official universe continuity; it's always been left to production teams to make up their own, and Russell T Davies has never stated the Doctor he writes for is half human.