I know who you're talking about, but numbers for 5th gen is much lower than their predecessors. The only group selling similar numbers to 4th gen is Babymonster. Other than that it's much lower, so scale in sales has changed because many are still hanging onto 4th gen groups tbh. It's why this whole gen thing is nonsense because the people decide when to move on and not companies.
Also, sales surges can still happen beyond the first week. Word of mouth will always improve things and I think many of these groups will benefit with that when comes to selling and charting.
