So, researching for the Battalion Chronicles rewrite of DBVW, I learned that thanks to DBL and SDBH, there used to be two types of Saiyans. Yamoshi and his crew were ‘Super Saiyan Gods,’ the kind Saiyan subspecies. Cumber and basically everybody else were ‘Evil Saiyans.’ They took down Yamoshi and his crew leaving only the Evil Saiyans, which is why modern Saiyans were all evil. Until Goku, technically.

Currently trying to incorporate these into the lore, which includes jumping back to Age 525 for the prologue.