ok hear me out i just had this thought and it works
for the top groups in each gen (not counting first since i know zero about them) there was a pattern of :
1) no.1 gg, 2) its rival (debatable no.1 gg because of SEA/West dominance), 3)the solid 3 gg, and then the rest switching no.4: the gg who's only good in digitals, the GG who has a big fanbase but not always delivering a hit, the late bloomer consistent gg
*Strictly about the high of each gen and in Korea, because patterns do fall after 5 so years of activation, and Western fame does not seem to have a pattern line korea..
2nd gen : SNSD --> 2NE1 --> Wonder Girls --> SISTAR, F(x), APINK
3rd gen : TWICE --> BlackPink --> Red Velvet --> Mamamoo, G-friend , OMG
And so my guess for 4th gen:
4th gen: NewJeans --> aespa --> I'VE --> LeSserafim, NMIXX / ITZY, STAYC / GIDLE
4th gen does have some very competitive ggs, most than any gen I saw tbh.
Thoughts?