The winner of normal gnw doesn't always go to cross-server gnw since it's only the top 8 servers who meet the criteria (points acquired from normal gnw and then total group power) gets to do cross gnw.

As long as one group attends normal gnw, they still get the packs. Let's out the three groups, one is in the top 8. This means that one group has to do cross gnw while the other two just do normal gnw. If this happens, both gnws happen at the same time for the affected groups. If none were able imto make it in the top 8, it's just normal gnw.