I also remembered Mumei has her health problems always popping up which wouldn't be good. She has the cuteness, is probably En's best singer, apparently is parasocial and that always nets fans and merch, and is just very likeable. Shame her health issues, shyness, and lack of exposure compared to Gura won't allow her to take the spot if push comes to shove.
Hololive found its stride with Gen 3 bringing powerhouse talents like Pekora, Marine, and Rushia. Likewise ID3 gave us Kobo and Kaela who are doing amazing. Perhaps third time's the charm for HoloEN to strike gold?