As for grad/gorod, that is true. But the use of grad can be explained in one of two totally different reasons:
A) The Letts corrupted "gorod" into "grád" when they first adopted the word.
B) The word in old Anglo-Baltic was "gorád" and was eventually shortened into "grád"
What it came down to is that I used "grád" because it was a quick loanword from Russian to throw in.
The Normans might be on the horizon, but not in the way one might think.
Gunvald still has much to do.