I read somewhere here in the Lore Forum that the races from each shard have independently evolved.

Should I understand it that the races that we can play (Hyur, Lalafell, Elezen etc.) didn't exist yet pre-Sundering or that they only existed after the Sundering? Wouldn't that mean that Dwarves, Galdjent etc. from the First coincidentally emerged to parallel the likes of the Lalafell, Roegadyn etc. from the Source?

Or did I happen to have a misunderstanding and all the races already existed pre-Sundering and then the split (Source + 13 Shards) happened?