I loved the reveals about Nin'janjin and the Viroi that we got in TGO. Basically the Samurai of Nonmen.
There's also an interesting line somewhere during the Battle of Dagliash in which the Sranc are referred to as "Sons of Nin'Janjin". I wonder if perhaps Nin'janjin was the first specimen the Inchoroi used to crack the Nonman's bios and create the Sranc? Might also be how they learned how to make the first Inoculation for Nin'janjin himself.
Good catch, I think such a thing is almost certain.
Also, his bios is almost assuredly what they used to fashion the Immortality Treatment, AKA the Womb Plague.
Ironically enough, the Womb Plague is so doubly Cû’jara-Cinmoi's fault, since he forced Nin'janjin's hand by denying them help and even capitalizing on an exigent disaster to consolidate his (and Siöl's) own power. It's plausbile that the Inchoroi would have eventually captured a Nonman and so reverse engineered their bios anyway, but considering that the Womb Plauge came as a side effect to the Inchoroi attempting to actually save their Nonman allies, there may well have been Sranc and Bashrags, but no Womb Plauge if Viri (and so Nin'janjin's) hand were not so forced.