So I have no idea if this has been discussed, it doesn't seem all the original of a thought so I imagine it has...

I was thinking earlier that just based on how this story is playing out, I think it's not a natural in-born trait that Garleans can't use magic. I think it's more likely that they are facing consequences of their ancestors or perhaps they have further split souls than the rest of Hydaelyn? Perhaps the further dilution causes them to not being able to access magic... but then their third eye comes into place and I don't know. Does anyone recall any discussions about them that I could read up on? I don't have access to the encyclopedias, sadly.