I agree. For Epoch Cassette Vision as example, I found only one game (Wheelie Racer [d1].scv) in internet, but no dumped bios. Maybe someone can ask Takeda Toshiya, not sure he will help ?
Probably not coincidence that that's the cart I sent Guru. I sent an email to Takeda Toshiya once, but no response. Maybe someone else could try, especially someone in Japan. We are looking at duplicating a lot of work that's already been done collecting and dumping games, because the dumps just don't seem to be available.