Well, based on the preorders alone, they have already secured the sales, which is the primary factor people use to dismiss them from the top 3 of the 4th gen girl groups discussion. Now, with that number and if they continue charting well with PAK, they could comfortably maintain their throne without anyone bringing up another name into the discussion. No one doing it like them especially almost 6 years in their careers and still able to get PAK.
Honestly, they are the most impressive among 4th gen girl groups as they've been around for almost six years, yet continue to increase in popularity rather than experiencing a decline like most groups, both in charts and sales. With this trajectory alone, they should be on top 1 as others can't really proved they have this kind of longevity yet.