Ok everyone sit down for a second, because this shit is getting deeper than the core of the earth.

Basically, it argues that inklings and octarians are evolved from bloopers and octorocks, respectively. Now, in Mario Kart 8, one of the DLC packs introduced Link, showing at least somewhat of a connection between the two worlds. However, there's another character that links (no pun intended) this all together:
Kirby.
Why Kirby, you may ask? Well, in Super Star and Ultra, Mario and his friends can be seen in the background of the Megaton Punch minigame and the Dedede fight, cheering him on. The reason this is so significant is because in another Kirby game, specifically Kirby 64, there's THIS:

Shiver Star, commonly believed to be a post-apocalyptic version of Earth.

Sometimes, i really hope the Human remains are discovered like that…