The average ranks of the people on the Green Planet was only rank 3 to rank 4, though.
After all, it was not that easy to improve one's rank.
The people in their small circle was lucky because each and every single one of them have enough background family and resources invested on them.
Otherwise, it would be a pipe dream to reach their current rank.
In this way, the training method for rank 7 and above were still kept secret by the higher ups and the few people who have access to it. Not everyone was so selfless to be willing to donate everything for the world.
Rank 7 was already a high rank.
People at that rank already had the capabilities to destroy cities and further improvements would be even more difficult.
The higher ups will probably control it strictly.
Riya was not entirely sure.
