Your time scales are discordant. Pangaea broke up long before there were primates, let alone humanoids
Upon further looking, yes. You are correct.
Still though, where are the fossil records of groups of humans migrating to China from Africa? Yes, we know about the caucasians. But the Yellow River gave rise to settlements well before The Caucasians started visiting them.
When/how did the Chinese get there? Why are they SO different (physically) from the other races? (I use "race" to simplify the arguement) We can see that Africans look like Semites look like Indians. Where did this change in skin tone and bridged noses come in? Why does it effect them universally? Why are caucasians the only ones capable of getting red hair genetically?
If we all came from africa, wouldn't red hair be possible in all the races? Surely there are mild climates in Africa and India that would allow for lighter colorign of people.