Why should we include Scandinavians? True they might have been as powerful as some other tribes, but some of those other tribes we are considering ended up carving up kingdoms of their own.

Which leads to my next point. We have more sources on those tribes that were more successful and we are not going to choose factions which we will have much trouble getting sources on and manpower to work on. *cough*Saba *cough*
And be careful with what evidence you come with. I've seen some theories and "evidence" here at the University in Bergen about ancient Norwegians.
Like us being Caucasus immigrants due to that we have some words remarkably similar to Assyrian. Although that theory has a few merits...

Now take the Bastarnae/Bastarnoz. They were probably Germanic and we know a few bits about what they did and who they fought for. However there is still speculation on how Germanic they were, were they Germanic at all, how much influenced were they by Sarmatians, Getai & Celts? Were they Sarmatians or Getai?
We don't know much about the Bastarnae, which is probably why they will not be in EB2.