Are Gidle and aespa only ggs from 4rd gen that did not peak during their rookie era?

Quote from number-one

There is actually some groups that released their biggest song after rookie era, but I guess AKP users could not find them

NATURE with LIMBO did after 4 years of their debut. It is their biggest song

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Nature never charted top 100 on Korean charts, I know Limbo was their highest ranked in terms of download charts.

But girls was a popular song on YouTube, between their regular and censored MV they have close to 10 million views.

But regardless if 'Girls' or 'Limbo' was their peak, you are right, they still did it after their rookie years.