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Starting with the introduction of hololive Myth (holoEN 1) in September 2020, Myth and every subsequent hololive generation with at least 4 channels has ended up with the channel that debuted 4th having the largest count of subscribers.
This holds true for:
-Gawr Gura (holoEN 1 / September 2020)
-Nanashi Mumei* (holoEN 2 / August 2021)
-Sakamata Chloe (holoJP 6 / November 2021)
-Fuwawa and Mococo Abyssgard (holoEN 3 / July 2023)
Juufuutei Raden (holoDEV_IS 1 / September 2023)
*Mumei initially debuted 4th under "Council". When "Council" was effectively replaced by "Promise" (Council members + IRyS), she still technically debuted 4th among the 5 of them since both IRyS and Sana debuted before her.
The last time this "4th debut = highest subscriber count" pattern was not true was the debut of holoJP 5, whose 4th debut was Mano Aloe.
Raora Panthera is slated to be 4th debut of her generation (holoEN 4). She is around 300 subscribers below the highest currently: a marginal difference. Even if she doesn't have the highest count by the end of all of the debuts, the pattern could still uphold itself *eventually*. Mumei had less subscribers than IRyS, who had a month head-start, and even Kronii when they intially debuted before eventually surpassing both. The same is true with Chloe and Laplus.