Honestly, now it's becoming a bit bothersome: you really want me to post again the phrase about the "Place I grew up" and explain, again, why It can't be GV since we know for a fact Shanks didn't grow up in GV at all?
As I said, I am more than fine with you believing It's GV. If you say, "I prefer to ignote the first part of his phrase and just use the second" because reasons, It will be ok for me. Go on.
Oda himself does, so you might be right in the end.
What I can't agree on is saying that Is a fact becuse, as I said, if there Is a fact here Is that GV cannot be, in any way, "the place in which Shanks grew up".