So this one was all ready made up, but here it is. The theory is called the "genocide theory". Inklings and Octolings are at war! This can be proven by the noises you can hear in all of the boss kettals in splatoon 1, but in the Octo Samurai boss battle you can hear screams of pain and metal clanking. People also say that the Inklings want the Octolings extinct.