User blog comment:FairyRaven/Exceeds and Earth Land Counterparts/@comment-4829046-20120820134427/@comment-5268982-20120820192750

I think that the Dragons' origin is Earth Land, and that's why they have Edolas counterparts. But your theory does make a lot of sense, as well.

Now, as for the motion sickness, I think that, like the Exceed buddy thing, it is something exclusive to Dragon Slayers. At least those who grew up with Dragons. The reason why Wendy probably does not have motion sickness is her Troia spell (I think that's how it was called). As for Gajeel, I really want to know why he got an Exceed that late and why he was not motion sick until the games. Sting also told him something like "so, you finally became a true Dragon Slayer..." when he was motion sick for the first time. What was that supposed to mean? As for Cobra, he got his powers by a lacrima, so maybe he is an exception,