Theres 2 scenarios

1) Abundance of groups to form full xGNW bracket

- In this situation, each server well send their respective top placed groups for that weeks GNW, with power as the tiebreaker

eg: a) 3 servers exist in the cluster - top 2 placed groups in each servers GNW will be sent, as well as the top 2 power groups that achieved 3rd rank for that week (the weakest 3rd rank group will miss out since there's only 8 spots available)

b) 10 servers exist in the cluster - only the top 8 first placed groups ranked by power will make it to xGNW, 2 winners will miss out.

2) Lack of sufficient groups

- For this case, xGNW will either be 1-4 or 8. If lets say only 6 groups participated in normal GNW that week, only the top 4 will move on to xGNW, the last 2 ranked groups will have to register for normal war again during the xGNW week.