I read it differently. The first gen was JP/EN, and EN managed to grow to what it is now. Sakana's been throwing back the profits from EN's growth to help EN grow to the size it is now. Now that EN is making solid money, Sakana's going to get the JP branch up and running. I don't think the money the JP branch made would be enough to support the staff supporting the JP girls, let alone enough to fund models, advertising, animated introduction trailers and so forth, that's the money EN's been making.
There will be at least one bilingual streamer, but not to gain EN viewers. Rather, they'll help with cross-company collabs and professional inter-company communication.