Sorry, I used the word Nordic instead of Scandinavian. I certainly think that it's a strong possibility that Z58 appeared first in Denmark or south Sweden and had major branches in both directions.
Z63 branches of all types were spread by the eastern wandering Gothic tribes and also the western migrators to the British Isles.
I know we call the Gothics German but is that completely accurate? How about the Angles/Saxons/Jutes? Are the Danes the official border of Scandinavians despite the proximity and similarity of the aforementioned "Germanic" tribes?
We know a Germanic people were in Wielbark at a specific time but that part of Europe was highly volatile regarding populations. That is the fun of European history. If the mysteries we're all solved then we would be out of a hobby.